Corrosion of the casing is also the cause of air heater leakage

Corrosion of the casing is also the cause of air heater leakage

Leakage at the pipeline is generally caused by the deposition of water quality in the heat dissipation pipe or the corrosion of scale in the heat dissipation pipe. There is no unified industry standard for the water quality used in air heaters in our country, and the water quality has a significant impact on the corrosion of the inner walls of the heat dissipation pipes.

The corrosion at the connection of the heat dissipation pipe is caused by the corrosion of chloride ions in the water on the welding points, especially at the turning of the heat dissipation pipe, where chloride ions accumulate, leading to more severe corrosion at the connection.

The corrosion of the casing is also the reason for the leakage of the air heater. The shell of an air heater is generally made of steel and aluminum, which has a certain degree of corrosion resistance. However, if exposed to acidic or alkaline substances for a long time or in a humid environment, the corrosion at the steel aluminum connection is more pronounced due to the susceptibility of the steel aluminum connection to electrolytic corrosion.

In recent years, with the demand for desulfurization projects in large power plant units, the power of air electric heaters has increased by over 400kW. Power consumption is high, operating costs are high, and it is necessary to consider the following aspects to minimize power.

Reasonably describe the air volume and temperature rise. The power of the air electric heater is determined based on the calculation of air volume and temperature rise. On the premise that the air volume and temperature rise meet the requirements, it is not advisable to choose an air volume that is too large. Due to excessive air volume and temperature rise, the power and energy consumption of the heater directly increase. The air volume is too large, and the temperature rise is unnecessary. Summarize and think, describe reasonably, and determine appropriate parameters.

The appearance of the air electric heater should be insulated. Most power plants (owners) only insulate the pipes at the outlet of the air electric heater when using it, without any insulation treatment on the appearance of the electric heater itself. According to the data, adding an insulation layer to the surface of an electric heater can reduce energy consumption by 5% to 10%. If the running time is long, the energy savings are often considerable. The power plant (owner) should install insulation layer on the pipeline and install insulation layer on the air electric heater.

Reduce the pressure loss of the air electric heater itself. When the air that needs to be heated flows through the air electric heater, pressure damage occurs. The greater the pressure loss, the greater the energy consumption of the fan, and improvements should be made to the layout of the air electric heater itself. Innovation minimizes pressure loss.

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