01. Frontier Overview
Blast furnace flues generally use spray coatings, but due to the corrosive nature of the flue, high-strength wear-resistant spray coatings must be used. The lining atmosphere of the large flue windbox is even worse than that of the large flue, so high-strength wear-resistant spray coatings must be used. coating.
02.Difference
The difference between wear-resistant and high-strength spray coatings is the difference in aluminum content and density, which means that high-strength wear-resistant and wear-resistant spray paints of the same material are of higher grade. High-strength wear-resistant spray material is higher in strength, denser, and more resistant to erosion and wear. Because it has a certain rebound rate during construction, a 10%-20% margin should be added when planning usage.
The lining of the blast furnace smoke bellows can also be made of plastic, because the plastic binder is composed of phosphoric acid, which has strong adhesion and is resistant to wind intrusion and wear. Moreover, plastic construction is also easy and does not require professional construction. What shape is it pounded into, and the thickness is the same as the thickness of the spray paint. However, the cost of plastics will be much higher due to the increase in the price of phosphoric acid.
03. Choose one of high-strength spray paint and fire-resistant plastic
You can choose between high-strength spray paint and fire-resistant plastic for the lining of the large flue windbox. It is not necessary to use one. If the planning cost allows, using fire-resistant plastic will be better than using high-strength wear-resistant spray paint. The cycle will be longer. But it is also possible to use high-strength ones, because they are equally wear-resistant and erosion-resistant in use, but the length of the cycle is different.
04.Conclusion
However, ordinary FN-130 or FN-140 wear-resistant spray paint cannot be used for this part of the windbox, because ordinary wear-resistant spray paint is not good, and its erosion resistance is average, so it is not suitable for use in large flues, let alone Use more demanding windbox linings, because ordinary ones will peel off and be replaced within a few months. Replacement back and forth does not save costs, but causes unnecessary trouble to production and operations.
Therefore, it is a good choice to use high-strength wear-resistant spray paint or fire-resistant plastic for the lining of the air box.