Problem Description: The start-up and shutdown of cement kilns, operational adjustments, and the functioning of vertical mills and grate coolers cause rapid and severe fluctuations in the temperature, flow rate, and dust concentration of the flue gas entering the ESP. This demands an extremely wide operational adaptability from the ESP; otherwise, it is highly prone to failure due to thermal stress, condensation, or overload.
1. Equipment Structural Reinforcement and Insulation: Strengthen the rigidity of the casing and internal components to withstand thermal stress. Implement high-standard insulation on the ESP casing and hoppers to ensure the wall temperature remains above the acid dew point (typically >120°C), preventing internal condensation that leads to equipment corrosion and dust hardening.
2. Intelligent Adaptive Control System: Adopt an intelligent control system interlocked with the production process. This system monitors real-time parameters such as inlet temperature and pressure, automatically adjusts rapping modes and power supply characteristics, and coordinates with conditioning towers to ensure optimal dust collection conditions under any operating scenario.
Problem Description: Cement raw meal powder and kiln exit dust possess a certain degree of adhesiveness. Particularly when temperature control is inadequate, they tend to adhere to the discharge electrodes and collection electrodes. This not only reduces the effective dust collection area but can also lead to "corona quenching" (where dust envelops the discharge electrodes, suppressing corona current generation) and render rapping cleaning ineffective, creating a vicious cycle.
1. Enhanced Rapping System: Employ more powerful and efficient rapping methods such as side-mounted rotating hammer rappers or top-mounted electromagnetic rappers. Implement different rapping cycles and intensities for different electric fields (e.g., coarse dust in the first field, fine dust in the third field) to achieve precise cleaning.
2. Anti-adhesion Design for Discharge and Collection Electrodes: Utilize discharge electrodes like spiral electrodes or fishbone electrodes that are less prone to dust accumulation, and collection electrode plates such as large C-type or ZT24 plates that are resistant to deformation. This reduces dust adhesion through structural design.
