Summary of boiler tube rust removal processes

In industrial production, the efficient operation of boiler tubes is essential to maintaining a stable production process. However, rust formation can compromise their performance, making an effective iron removal process crucial. Below are the primary methods used to remove rust from boiler tubes.

Physical Methods for Boiler Tube Rust Removal

1. Water Flushing

This method involves using high-speed water flow to flush out rust and silt from the inner walls of the boiler tube. It is particularly suitable for thick, curved tubes with multiple side holes. While simple to operate, it requires a significant amount of water.

2. Friction Cleaning

A mechanical brush head is inserted into the tube to scrub away rust and sediment. This method is highly effective for rougher pipe systems but requires careful operation to ensure safety.

Chemical Methods for Boiler Tube Rust Removal

1. Pickling

In this method, an acid solution is injected into the tube to react with and dissolve rust deposits. While highly effective, the concentration, exposure time, and temperature must be strictly controlled to prevent corrosion. Different boiler tube materials, such as carbon steel and seamless steel pipes, have varying acid tolerances, necessitating adjustments in the acid formulation and treatment parameters.

2. Alkaline Washing

An alkaline solution is used as the primary cleaning agent to dissolve accumulated insoluble substances and remove rust. This method is relatively simple but must follow strict concentration and exposure time guidelines.

3. Oxidation-Reduction

This process utilizes chemical reactions to reduce rust into iron ions, which are then removed with a cleaning agent. It is considered a safer method, but precise control of the reaction solution concentration and operating conditions is necessary.

Mechanical Methods for Boiler Tube Rust Removal

1. High-Pressure Flushing

High-pressure water is used to dislodge rust and sludge from the boiler tube interior. This method is efficient but requires professional handling, especially for tubes connected by pipe flanges, as excessive pressure may affect joint sealing.

2. Blasting

This technique employs controlled explosions to create a radial impact on the inner tube walls, rapidly removing rust and sediment. Although highly effective, the boiler tube must be inspected and repaired as necessary following the procedure.

Conclusion

Each iron removal method has its advantages and limitations. The choice of technique should be based on the specific condition of the boiler tubes. Regardless of the method used, safety precautions must be strictly followed, and operations must comply with relevant laws and industry standards to prevent accidents.