Analysis of Causes and Maintenance of Corrosion in Dust Removal Skeleton

In industrial dust removal systems, the dust removal skeleton is a key component supporting the filter bag, and its performance directly affects the service life of the filter bag and the overall operating effect of the dust collector. However, in practical use, the dust removal framework often faces corrosion problems. Once the dust removal framework corrodes, it not only reduces its structural strength, causing deformation and damage to the filter bag, but may also affect the dust removal rate and increase equipment maintenance costs. Therefore, a thorough analysis of the causes of corrosion in the dust removal framework and the adoption of maintenance measures are of great significance for determining the stable operation of the dust removal system.

1、 Analysis of the Causes of Corrosion in Dust Removal Skeleton

（1） Environmental factors

Humidity influence: High humidity environment is one of the common factors causing corrosion of dust removal skeleton. When the environmental humidity is high, water in the air will condense into water droplets on the surface of the dust removal skeleton, forming a layer of water film. The presence of water film creates conditions for electrochemical corrosion, causing the metal skeleton to undergo chemical reactions with water and oxygen, gradually being corroded. In some damp production workshops or when dealing with smoke containing a large amount of water vapor, the dust removal framework is more susceptible to erosion by humidity. For example, in the food processing industry, if the humid and hot gases generated during the production process enter the dust collector and are not treated, it will accelerate the corrosion process of the dust removal skeleton.

Corrosive gas action: The smoke generated in industrial production often contains various corrosive gases, such as sulfur dioxide (SO ₂), hydrogen chloride (HCl), nitrogen oxides (NOx), etc. These corrosive gases dissolve in the water film on the surface of the dust removal skeleton, forming an acidic solution that causes strong corrosion to the metal skeleton. Taking coal-fired boilers as an example, the flue gas produced by coal combustion contains a large amount of sulfur dioxide. In humid environments, sulfur dioxide reacts with water to form sulfurous acid, which is then oxidized into sulfuric acid. This corrodes the steel material of the dust removal skeleton, causing problems such as rust and perforation on the skeleton surface.

Dust characteristics: Some dust itself is corrosive, or the dust can produce corrosive substances under certain conditions. For example, dust containing acidic and alkaline components will directly undergo chemical reactions with metals after coming into contact with the dust removal framework, causing corrosion. In addition, some dust particles have hygroscopicity, and after adsorbing moisture, they will form corrosive electrolyte solutions that adhere to the surface of the skeleton, accelerating the corrosion process. Some dust generated in the chemical industry may contain components such as chlorides and sulfides, which have good corrosiveness to the dust removal framework.

（2） Material and manufacturing process factors

Improper material selection: The material of the dust removal skeleton plays a decisive role in its corrosion performance. If the use environment and dust characteristics are not fully considered when selecting the skeleton material, and non corrosive materials are chosen, it is easy to cause corrosion problems. For example, the dust removal skeleton made of ordinary carbon steel is prone to rust and corrosion in environments with good corrosiveness; Although stainless steel material has good corrosion resistance, there are differences in its corrosion resistance among different types of stainless steel. If the selection is improper, it cannot meet the requirement of being less prone to corrosion.

Manufacturing process defects: In the manufacturing process of dust removal skeleton, if the welding process is poor, defects such as porosity and slag inclusion are prone to occur at the weld seam, which can become the starting point of corrosion and accelerate the corrosion of the skeleton. In addition, inadequate surface treatment processes for the skeleton, such as uneven surface coatings, insufficient thickness, or lack of bonding between the coating and the metal substrate, cannot provide protection and directly expose the metal skeleton to corrosive environments, leading to corrosion.

（3） Operation and maintenance factors

Improper dust cleaning: The dust cleaning system is an important component in ensuring the normal operation of the dust removal framework. If the cleaning method is incorrect, the cleaning intensity is too high, or the cleaning frequency is too high, it will cause mechanical damage to the dust removal skeleton, damage the protective layer on the surface of the skeleton, and directly contact the metal with corrosive substances, thereby causing corrosion. On the contrary, if the dust is not cleaned in a timely manner, a large amount of dust will accumulate on the surface of the skeleton, forming a damp dust layer and exacerbating the degree of corrosion.

Abnormal operating parameters: During the operation of the dust collector, abnormal parameters such as temperature and pressure can also affect the corrosion performance of the dust removal skeleton. For example, when the flue gas temperature is too high, it will accelerate the oxidation process of metals, reduce the strength and corrosion resistance of metals; However, if the temperature is too low, it may cause condensation of water vapor and increase the risk of corrosion. In addition, the internal pressure of the dust collector is unstable, and the pressure fluctuations generated can cause repeated stress on the skeleton, leading to fatigue damage and also damaging the surface protective layer, accelerating corrosion.

Lack of maintenance: Lack of regular maintenance is one of the important reasons for the corrosion of dust removal skeleton. During the operation of the equipment, failure to timely check the corrosion of the skeleton, failure to repair the surface protective layer, or failure to treat the corroded areas will gradually worsen the corrosion problem. At the same time, failure to maintain the cleaning system and the internal environment of the dust collector can indirectly affect the corrosion performance of the dust removal framework.

2、 Maintenance measures for dust removal skeleton

（1） Optimize materials and manufacturing processes

Correct material selection: Choose the appropriate dust removal skeleton material based on the actual usage environment and dust characteristics. For working conditions with good corrosiveness, choose stainless steel materials that are not easily corroded, such as 316L stainless steel, which has good resistance to acid and alkali corrosion; If the working conditions are relatively mild, carbon steel materials that have been treated (based on actual reports) can be selected. When selecting materials, ensure that the quality of the materials meets relevant standards and purchase from legitimate suppliers.

Improve manufacturing process: Enhance the manufacturing process level of the dust removal skeleton, strictly control the welding quality, and ensure that the weld seam is uniform, free of pores, and slag inclusions. The surface treatment processes used, such as hot-dip galvanizing and spray coating, increase the thickness and adhesion of the protective layer on the skeleton surface, and improve its corrosion resistance. In the manufacturing process, quality inspection is added to strictly check the dimensional accuracy and surface quality of the skeleton, and the product meets the requirements.

（2） Improve the operating environment

Control humidity: Take specific measures based on clinical effects to reduce the humidity inside the dust collector. Specific clinical effect oriented equipment can be added in front of the intake duct, such as cryogenic type with clinical effect as the main body, adsorption type with clinical effect as the main body, etc., to remove moisture from the flue gas. At the same time, increase the sealing performance of the dust collector to prevent the entry of humid external air and reduce the chance of contact between the dust removal skeleton and moisture.

Handling corrosive gases: Pre treat flue gas containing corrosive gases before entering the dust collector. For example, using processes such as desulfurization and denitrification to remove corrosive components such as sulfur dioxide and nitrogen oxides from flue gas; For flue gas containing acidic gases such as hydrogen chloride, it can be treated through methods such as water washing and neutralization to reduce the corrosiveness of the gas and protect the dust removal framework from corrosion.

（3） Standardized operation and maintenance

Optimize the dust cleaning system: Adjust the dust cleaning method, cleaning intensity, and cleaning frequency correctly based on the nature of the dust and the skeleton material. To avoid damage to the skeleton caused by excessive cleaning intensity, and to determine the cleaning effect, timely clean the dust on the surface of the skeleton. A cleaning method combining pulse blowing and mechanical vibration can be used to improve the cleaning rate and reduce the impact on the skeleton.

Monitoring operating parameters: Real time monitoring of the operating parameters of the dust collector, such as temperature, pressure, air volume, etc., with fluctuations within the normal range. When parameters are abnormal, analyze the cause in a timely manner and take corresponding measures to adjust them to prevent corrosion of the dust removal skeleton caused by abnormal parameters.

Increase regular maintenance: Establish a good equipment maintenance system and regularly inspect the dust removal framework. Check the surface of the skeleton for corrosion, deformation, damage, etc., and promptly address any issues found. For slightly corroded areas, they can be polished, rust removed, and repainted (based on actual reports) with paint; If the corrosion is severe, the skeleton should be replaced in a timely manner. At the same time, regular maintenance and upkeep should be carried out on the dust cleaning system, dust collector box, etc. to ensure that the entire dust removal system is operating normally and create a good operating environment for the dust removal framework.

The corrosion of the dust removal skeleton is caused by multiple factors working together. By deeply analyzing the causes of corrosion and taking targeted maintenance measures, optimizing and improving from multiple aspects such as material selection, manufacturing process, operating environment, and operation and maintenance, the service life of the dust removal skeleton can be extended, the stable operation of the dust removal system can be determined, and the equipment maintenance cost and production risk of the enterprise can be reduced.