What is the reason for the explosion of porcelain in the glass-lined reaction kettle?

The glass-lined reactor is formed by spraying enamel with high silicon content on the surface of low-carbon steel tires and firing at high temperature to make the enamel adhere to the surface of metal steel tires. It has the dual advantages of glass-like chemical stability and metal strength. However, due to the different mechanical and physical properties of these two materials, the phenomenon of ceramic explosion will occur. The reasons for the explosion of ceramic equipment may be as follows.

1. Corrosion damage. If the medium environment of the glass-lined equipment does not match the use conditions of the enamel, or the thickness of the enamel layer does not meet the standard requirements, porcelain explosion may occur.

2. Mechanical impact damage: enamel is brittle and has poor impact resistance. The impact of any metal or hard object will cause damage to the enamel.

3. Installation deviation. It is usually due to excessive or uneven tightening force of bolts, expansion joints or bellows are not installed at the connection between equipment and pipelines, which will also cause large stress at the discharge nozzle and the opposite side of the nozzle, and the enamel glaze with poor plasticity Layers are destroyed.

4. Rapid change in temperature difference: The enamel layer of glass-lined equipment encounters sudden changes in cold and heat, and the porcelain is explosive. Since the linear expansion coefficient and elongation of the enamel are smaller than that of the steel plate, the deformation of the enamel after cooling is smaller than that of the steel plate. The enamel is bound by the steel plate to generate compressive stress, while the steel plate has pre-tension stress. Since the prestress is related to the linear expansion coefficient and elongation, and the linear expansion coefficient and elongation are closely related to the temperature, the working temperature has a great influence on the glass-lined reaction. If the temperature change causes the enamel to generate stress beyond its allowable stress, the enamel will break.

5. Overpressure damage. Generally, it is due to the overpressure of the medium in the jacket, which causes the inner wall of the glass-lined equipment tank to bulge, resulting in damage to the enamel.

6. Quality problems: there are defects in the firing process, resulting in scale explosion, mainly the quality of the metal body, the composition and uniformity of the enamel, as well as the pickling time, enamel firing time, and enamel firing temperature in the enamel firing process and many other factors.

7. The nozzle stress exceeds the allowable load. The allowable load of glass-lined equipment nozzles is less than that of general steel equipment nozzles. If the design of glass-lined equipment and piping system is unreasonable, under operating conditions, the local stress at the nozzle exceeds the allowable load, and porcelain explosion damage may occur at the connection of the equipment.

The reasons for the explosion of porcelain in the glass-lined reactor are mainly manifested in the above seven points. A detailed understanding of the reasons for the explosion of porcelain can make corresponding prevention and solutions in use, so as to better use the equipment and ensure the efficiency of the equipment. .