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Boiler Chemical Cleaning Technology
Introduction
Boiler cleaning involves removing corrosion products, scale, and other deposits that accumulate during boiler operation, thereby keeping the internal surfaces of thermal equipment clean, enhancing boiler thermal efficiency, improving steam‑water quality, preventing accidents caused by corrosion and scaling on heating surfaces, and ensuring smooth startup as well as safe, economical operation of the unit. Thanks to our strong technical expertise and proven track record, our company obtained Class A boiler‑cleaning qualifications as early as October 2005. To our knowledge, we are the only enterprise in the entire province of Hunan holding this qualification.
Technical Features
■ Inorganic acid cleaning formulation: short cleaning time, excellent performance, with a scale‑removal rate exceeding 95%; relatively low cost; stringent requirements for corrosion control (though appropriate corrosion inhibitors can meet relevant standards); disposal is cumbersome, requiring designated acid‑drainage locations such as coal yards or ash ditches; rinsing and passivation are carried out in a single step (no need to drain or rinse with water after rinsing—proceed directly to the passivation stage).
■ Organic acid cleaning (complexing) formulation: exhibits low corrosivity; delivers excellent rust and scale removal, with a descaling rate exceeding 90%; requires only a small dosage—3.0% or more already yields satisfactory results; demands relatively high operating temperatures, with optimal performance above 80°C; demonstrates effective results even under static soaking conditions; environmentally friendly, allowing direct discharge without causing pollution.
■ Neutral cleaning formulation: Low corrosivity; excellent rust and scale removal, particularly effective at completely eliminating rust deposits, with a descaling rate exceeding 96%; requires only a small dosage—1.5% or more delivers outstanding performance; operates under mild temperature and flow‑rate conditions, achieving good results at 40°C and superior results around 50°C, with excellent efficacy even during static soaking; non‑polluting, non‑irritating, environmentally friendly, and suitable for direct discharge.
■Excellent passivation performance: It forms a complete, dense gray passivation film with no pitting or secondary rusting.
Market Applications
|
Cleaning time |
Applying Unit |
Cleaning area |
Cleaning performance |
|
May 2006 |
Huafu Power Plant, Jiaozuo, Henan Province |
Boiler economizer, water-cooled walls, steam drum |
Cleaned thoroughly, free of copper plating, and a complete passivation film has been formed. The corrosion rate is less than 4.98 g/m²·h, and the descaling efficiency is 92.5%. |
|
October 2007 |
Henan Xin’an Power Plant |
Boiler economizer, water-cooled walls, steam drum |
Cleaned thoroughly, free of copper plating, and a complete passivation film has been formed. The corrosion rate is less than 3.66 g/m²·h, and the descaling efficiency is 91.9%. |
|
2007, September |
Sinopec Changling Branch Power Plant |
1# CFB boiler economizer, waterwall, and steam drum |
Cleaned thoroughly, free of copper plating, and a complete gray-white passivation film is formed. The corrosion rate is less than 4.17 g/m²·h, and the descaling efficiency is 95.5%. |
|
2008, April |
Sinopec Yizheng Chemical Fiber Cogeneration Center |
5# Boiler economizer, waterwall, and steam drum |
The acid‑washing demarcation line within the steam drum is clearly defined; the inner surface is thoroughly cleaned, with no residual deposits or copper plating, and a complete, dense gray passivation film has formed, free of pitting corrosion and secondary rust. The total corrosion weight loss is less than 25.92 g/m², the corrosion rate is below 4.32 g/m²·h, and the descaling efficiency reaches 97.3%, indicating that the acid‑washing quality is excellent. |
|
2009, 5 |
Xiangtan Iron and Steel Plant |
6# Boiler economizer, waterwall, and steam drum |
The acid‑washing interface within the steam drum is clearly defined, with no copper plating and a complete gray‑white passivation film formed. The corrosion rate is less than 4.65 g/m²·h, and the descaling efficiency is 95.0%. |
|
2010, August |
PetroChina Wushi Petrochemical Thermal Power Plant |
2# Boiler economizer, waterwall, and steam drum |
The acid‑washing interface within the steam drum is clearly defined, with no copper plating and a relatively intact gray passivation film. The corrosion rate is less than 4.86 g/m²·h, and the descaling efficiency is 91.2%. |
|
2010, September |
Sinopec Yuehua Olefins Plant |
Boiler economizer, water-cooled walls, steam drum |
Cleaned thoroughly, free of copper plating, and a complete gray-white passivation film has formed. The corrosion rate is less than 4.04 g/m²·h, and the descaling efficiency is 97.8%. |
|
December 2010 |
Sinopec Changling Branch Power Plant |
1# CFB boiler economizer, waterwall, and steam drum |
Cleaned thoroughly, free of copper plating, and a complete gray-white passivation film is formed. The corrosion rate is less than 3.26 g/m²·h, and the descaling efficiency is 98.2%. |
|
September 2011 |
Sinopec Luoyang Branch Thermal Power Plant |
1# and 2# boiler economizers, waterwall panels, and steam drums |
The acid‑washing demarcation line inside the steam drum is clearly defined, the surface is thoroughly cleaned, there is no copper plating, and a complete gray passivation film has formed. The corrosion rate is less than 3.8 g/m²·h, and the descaling efficiency is 96%. |
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Company Address
Chemical Equipment Maintenance Technology Training Base, Petrochemical Vocational and Technical College, Yunxi District, Yueyang City
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