What are the main factors affecting the wear rate of the boiler’s heating surfaces?

Last edited by dongjiang1001 on 2011-11-24 15:01: Flue gas composition and ash deposition on the heated surfaces； Flue gas velocity, and the cube of flue gas velocity, are proportional to wear rate ； Flue gas temperature, high-temperature and low-temperature corrosion ； Heated surface structure type. Under normal conditions, smoke velocity is the most important factor.

The main factors causing wear due to mechanical action: 1. The kinetic energy of the flowing fly ash, which is proportional to the square of the velocity. The amount of ash particles impacting the metal surface per unit time. It is related to the ash concentration and is proportional to the first power of the velocity. 3. Impact probability coefficient of fly ash. It is related to particle properties. Main factors affecting fly ash wear: 1. Fly ash concentration – Wear is more severe with fuels containing high levels of ash. Avoid smoke corridors. 2 Physicochemical properties of ash particles: the original properties of minerals in the fuel, methods of extraction and transportation, combustion methods, temperature conditions of the heated surfaces, etc. 3. Cubic relationship of flue gas flow velocity: When arranging the system, it is necessary to keep the flue gas flow velocity at a moderate level to avoid excessively high local flow velocities. 4. Arrangement of the heated surfaces and their structural characteristics