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  • 2022-01-14

Measures to prevent dew point corrosion of air preheater

In the previous article, we introduced the main reasons for dew point corrosion of air preheaters. Our company has also formulated feasible solutions for dew point corrosion problems, which are described in detail below.

1. Increase the exhaust gas temperature within a reasonable range

Although reducing the exhaust gas temperature can improve the thermal efficiency of the boiler, if the dew point corrosion of the air preheater is caused by excessive pursuit of low temperature emissions, it will not be worth the loss. Properly increasing the exhaust gas temperature can ensure the safe operation of the air preheater.

2. Carry out soot blowing and cleaning work in time

Ammonium hydrogen sulfate bonded fly ash adheres to the air preheater and is a very important cause of corrosion of the equipment. The timely removal of these bonded ash deposits has a great effect on preventing the corrosion of the air preheater. Gas shock soot blowing Although the air preheater can remove viscous dust well, the safety is not high. The patented product on-line dust cleaning equipment can remove dust on the air preheater well without causing damage to the pipe wall.

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3. Replace the corrosion-resistant air preheater pipe fittings

At present, most of the air preheaters on the market are made of carbon steel, which cannot resist corrosion very well. The titanium steel composite tube air preheater produced and sold by our company can not only greatly improve the thermal conductivity, but the outer layer is made of 316L stainless steel. It can resist the corrosion of sulfuric acid and other substances very well.

The dew point corrosion of the air preheater has a very serious impact on the equipment. We can prevent the dew point corrosion of the air preheater by increasing the boiler exhaust gas temperature, timely blowing soot to remove dust, and replacing pipe fittings.


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