Tue, 24 Jul 2018 02:04:52 +0000
The reason and method of dust removal must be used in vacuum furnace
Any boiler including vacuum furnace are the thermal energy into kinetic energy or mechanical energy, and therefore need a lot of heat transfer surface, due to the effect of adsorption of the heated surface, fuel the incombustible material was adsorbed on the surface heat transfer and thicker, the residue not only hinders heat transfer, and lead to corrosion of the heating surface, the greater the fuel ash content of low melting point material, the more will leave a lot of ash.
A thick deposit of scale occurs on the heated surface. This will greatly increase the difficulty of vacuum furnace maintenance and reduce the service life. The viscosity of these scaling substances varies from place to place in the boiler. Due to different melting points and condensation of ash, some of them are liquid or semi-liquid and some are dry solids. Of course, dry solid scale is ideal. If these deposits are not removed in time, they will bring adverse consequences to the vacuum furnace.
How to clean the vacuum furnace properly
It is known that the vacuum furnace is used for heating in the vacuum environment. Although it is used in the vacuum environment, it will also generate a lot of scale waste, which requires frequent dust removal and attention to the maintenance of the vacuum furnace. Many people don’t know how to clean a vacuum furnace. Here are some tips.
1. Because there is a considerable amount of sulfur dioxide in the flue gas, it will become sulfur trioxide (commonly known as dilute sulfuric acid) in the presence of water, which will cause corrosion on the surface of the heat exchanger tube. The same principle applies to the vacuum return furnace, which requires the same maintenance.
2. As the scale on the heated surface will become thicker and thicker, a thermal insulation layer will be formed, which will directly affect the heat exchange and reduce the thermal efficiency of the boiler. The vacuum annealing furnace is used in a similar way.
3. As the scale on the heat exchanger tube wall becomes thicker and thicker, it is equivalent to that the heat exchanger tube becomes thicker and thicker, which reduces the air permeability between the heat exchanger tubes and increases the resistance of smoke emission, which will bring certain influence to the normal combustion of the boiler.
4. At different locations of the vacuum furnace, the location of scale accumulation is also different. Where the scale accumulation is thick, the air permeability cut-off area decreases, and the resistance of the air flow increases. As a result, the gas flow velocity in places with less scale increases and the time is longer, a high-speed airflow channel will be formed. Because there are many non-combustible solid materials in the flue gas, the heat exchange pipe in the high-speed airflow passage will wear out quickly and be forced to stop the furnace for maintenance.