How to prevent leakage of pipe electric heater?

How to prevent leaks in duct heaters?

Leaks in ducts are generally caused by water deposits or scale corrosion in the radiator tubes. There is no unified industry standard for water quality used in air heaters in my country, and water quality significantly affects the corrosion of the inner walls of the radiator tubes.

Corrosion at radiator tube joints is caused by chloride ions in the water corroding the welds. Chloride ions accumulate, especially at bends in the radiator tubes, leading to more severe corrosion at the joints.

Corrosion in the casing is also a cause of air heater leaks. Air heater casings are generally made of steel and aluminum, which offer a certain degree of corrosion resistance. However, if exposed to acids and bases or in humid environments for a long time, corrosion at the steel-aluminum joints can become more pronounced due to electrolytic corrosion.

In recent years, with the demand for desulfurization projects in large power plants, the power of electric air heaters has increased by over 400 kW. This results in high power consumption and operating costs. Consider the following aspects to minimize power consumption.

Properly describe the air volume and temperature rise. The power of an electric air heater is calculated based on the air volume and temperature rise. As long as the air volume and temperature rise meet the requirements, it's not advisable to choose an excessively high air volume. Excessive air volume and temperature rise directly increase the heater's power and energy consumption. Excessive air volume and temperature rise are unnecessary. Summarize your thoughts, make a reasonable description, and determine appropriate parameters.

The exterior of the electric air heater should be insulated. Most power plants (and owners) only insulate the piping at the heater outlet when using electric air heaters, without insulating the heater itself. Data shows that adding insulation to the heater's surface can reduce energy consumption by 5% to 10%. Over long operating times, the energy savings can be substantial. Power plants (and owners) should install insulation on the piping and on the electric air heater itself.

Reduce pressure loss within the electric air heater. When heated air flows through the electric air heater, pressure loss occurs. Greater pressure loss increases fan energy consumption. Improvements should be made to the layout of the electric air heater itself. Innovation can minimize pressure loss.