Vertical steam boiler oil to gas, reasons for furnace tube carbonization
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Recently, there was a 2T vertical oil (diesel) boiler that was damaged by the Kunshan earthquake. After the person who was burned by the burner changed to a dual-purpose burner, the furnace tube was severely carbonized. Can you guys help me analyze the reason? Thank you!
It may be that the temperature of the outer tube wall of the furnace tube exceeds the allowable range of the material.
High-temperature coking and carbonization corrosion heating furnaces all have coking problems. Different process conditions lead to different coking severity. Generally, coking is more serious in working conditions with heavy components, high temperature, and slow flow rate. Coking can cause excessive mild carburization of the material. An average thickness of 1 mm can increase the wall temperature by 30 to 50°C. The high-temperature oxidation on the surface of the furnace tube is aggravated, which accelerates the thinning of the tube wall and causes the furnace tube to bulge and break. Coking of the furnace tube will accelerate carburization of the material. Carburization results in changing the structural properties of steel. carburization: During the production process, highly reactive carbon atoms are produced. The process of gradual penetration and diffusion from the inner surface of the furnace tube to the interior of the matrix is called carburization. The carbon atoms in the coke in the furnace tube penetrate and diffuse into the matrix metal of the inner wall, and form Cr carbides with Cr in the matrix. Oxidation occurs when encountering oxygen, and the bonding force between matrix grains * * decline, causing microcracks. According to the process cycle of carburization, oxidation, creep, and cracking, the cracks continue to expand, causing leakage and damage to the furnace tube.