What is the cause of the blockage of the vacuum annealing furnace?

1. The air preheater is corroded at low temperature, and the surface of the heating surface becomes wet and rough, which intensifies the accumulation of ash.

2. The economizer leaks water and the furnace is not shut down in time, so that a water film is formed on the surface of the preheater, and the fly ash and the water film form a muddy paste. Block the tube.

3. During maintenance, flush the ash deposits of the economizer or air preheater with water, and start the operation before it is completely dry. As a result, the ash deposits intensify and cause blockage.

4. Insulation materials or other sundries in the quenching furnace fall into the air preheater, and the flue gas does not flow smoothly, which will aggravate the accumulation of dust and block it.

1. In the horizontal air preheater, the pipe pitch of the low temperature section is small, which causes the accumulation of dust to “bridge” and form a blockage.