Assessing the Performance of Fume Purifiers: Key Indicators and Selection Guidelines

According to the national safety production industry standard AQ 4237—2014 "General Technical Conditions for Welding Fume Purifiers," the purification efficiency of welding fume purifiers should be no less than 95%, and when used indoors, the exhaust concentration should be below 30% of the occupational exposure limit values in the GBZ 2.1 standard. This standard ensures that the purifier can achieve sufficient purification effects when dealing with welding fumes, thereby protecting workers from harmful substances.

In addition to national standards, the purification efficiency requirements for purifiers may vary depending on the type of welding process and materials. For example, the purification efficiency for fumes generated from non-alloy steel and low-alloy steel should reach 95% or higher, while for fumes from high-alloy steel, the purification efficiency should reach 99% or higher. This means that when selecting the appropriate fume purifier, the requirements for purification efficiency need to be determined based on the specific process and material characteristics.

Methods for testing the efficiency of fume purifiers include using particle counters to measure the concentration of particulate matter in the air. By comparing the concentration of particulate matter at the inlet and outlet of the purifier, the filtration efficiency of the purifier can be visually assessed. In addition, optical instruments such as light scatter meters or optical particle counters can also be used to measure the distribution and concentration of fume particles. These devices can provide detailed information about the size and quantity of particulate matter, thereby helping to evaluate the performance of the purifier.

Infrared spectroscopy is a more advanced detection method that can be used to identify and quantify specific chemical substances in fumes. This is particularly important for assessing the purifier's effectiveness in removing harmful chemical substances. Additionally, using a specific smoke generator to produce standard concentrations of smoke and then detecting the smoke concentration at the outlet after passing through the purifier is also an effective assessment method.

When actually selecting and assessing fume purifiers, in addition to considering filtration efficiency, other performance indicators such as processing air volume, leak rate, and working resistance should also be considered. The processing air volume determines the amount of fume that the purifier can handle, the leak rate affects the sealing performance of the purifier, and the working resistance is related to the energy consumption and operating efficiency of the purifier. These factors together determine the overall performance and applicability of the purifier.

The convenience of equipment maintenance and operating costs are also important factors to consider when selecting a fume purifier. Equipment that is easy to maintain and has low operating costs can reduce the operating costs of enterprises and improve economic benefits. For example, self-circulating weld fume purifiers have characteristics such as convenient installation and use, small footprint, and minimal impact on the original layout and production process of the workshop, making them a worthwhile option. By installing self-circulating weld fume purifiers, the air quality in the welding workshop can be effectively improved, providing workers with a healthy and comfortable working environment.

The smoke filtration efficiency of Beijing Aipet Fume Purifier is as high as 99.997% @ 0.3 microns, and it can be discharged indoors. The following is an example of one of the smoke filters. The filtration system uses a front-inlet structure with a large slanted surface and filter cartridges. The slanted surface collects large, hot particles into the ashtray while the heat-resistant filter material improves safety. The system's top-inlet design allows dusty gas to enter the filter element after a 90-degree turn, prolonging its lifespan.

1. Polluted airflow entering the machine;

2. Large slanted surface inlet collects large particle high temperature particles into the ashtray.

3. Flame-retardant filter cartridges with a filtration precision of 1 µm and a filtration efficiency of 99.15%;

4. HEPA high-efficiency filters (main filter) with a filtration precision of 0.3 µm and a filtration efficiency of 99.997%.5. The fresh air goes into the workshop again.

In summary, selecting an appropriate fume purifier requires a comprehensive consideration of factors such as filtration efficiency, processing air volume, leak rate, working resistance, maintenance convenience, and operating costs. By scientifically evaluating and selecting, the fume purifier can play the maximum role in industrial production, protect the health of workers, and also protect the environment from pollution. With the continuous advancement of technology, future fume purifiers will be more efficient and intelligent, providing a cleaner and safer working environment for industrial production.