What anti-corrosion measures are appropriate for wet desulfurization chimneys?
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A 35 tons/hour circulating fluidized bed boiler uses ammonia desulfurization. The desulfurized flue gas is discharged through a reinforced concrete chimney. Since it is wet desulfurization, and the flue gas is not heated before entering the chimney after desulfurization, the exhaust gas contains moisture. The temperature of the exhaust gas is about 50°C. The exhaust gas at this temperature is Anti-corrosion is not difficult, but since the flue gas is equipped with a bypass, that is, when there is a problem with the desulfurization device, the flue gas can be discharged to the chimney urgently through the bypass valve. Therefore, the temperature that the chimney withstands is about 50°C in normal conditions and about 175°C in abnormal conditions. Therefore, it is difficult to choose corrosion-resistant materials for the chimney. Please tell me: What kind of economical and reliable corrosion-resistant material should be used for chimneys under such conditions? Please give me some advice, thank you!
High temperature resistant refractory materials can be used, with clay bricks on the inside and red bricks on the outside.
There is a very important premise: there is a big difference between whether your chimney is to be built or the existing one needs to be renovated. If it is to be renovated, there is no good way, but epoxy resin and glass cloth can be used for anti-corrosion. The specific resin used depends on the nature of the flue gas. You can consult the resin manufacturer for details. Another suggestion is to add an emergency sprinkler system to spray water in the chimney to cool down.
Using high-temperature refractory materials should not solve the problem. Use acid-resistant refractory materials.
First, fiberglass lining. Second, high-pressure polyethylene hanging inside.
If we build it now, we can use refractory materials on the inner layer and red bricks on the outer layer! ! This is what our company is like.
You can consider using acid-resistant cement for anti-corrosion, which can solve the problems of high temperature and corrosion.
Refractory materials and red bricks cannot be used as anti-corrosion materials for wet desulfurization chimneys because they have poor corrosion resistance and acid penetration resistance. Glazed heat-resistant and acid-resistant bricks with low absorption rates can be used, but the masonry mortar must be made of materials that are temperature-resistant, acid-resistant, and impermeable. Note that water glass cement cannot be used for wet chimney anticorrosion.