The filtration effect of bag filters can be evaluated from multiple dimensions, including filtration accuracy, filtration efficiency, dust holding capacity, chemical compatibility, service life, and ease of operation. The following is a detailed explanation of these evaluation criteria:

1. Filtering accuracy

Definition: Filtering accuracy refers to the minimum particle size that a bag filter can filter out.

Evaluation criteria: The filtration accuracy of a bag filter is usually determined by factors such as the material, pore size, and thickness of the filter bag. The higher the filtering accuracy, the smaller the particles that the filter can intercept and the better the filtering effect. The common range of filtration accuracy is between 1 micron and 1000 microns, with a filtration accuracy of 1 micron being considered a relatively high level.

Influencing factors: The material, weaving method, and manufacturing process of the filter bag can all affect the filtration accuracy. For example, filter bags made of imported polypropylene (PP) filament fiber non-woven fabric can achieve a maximum filtration accuracy of 0.05 microns.

2. Filtration efficiency

Definition: Filtration efficiency refers to the proportion of impurities and particles that a bag filter can remove to the total number of impurities and particles.

Evaluation criteria: The filtration efficiency can be evaluated through experimental testing, such as collecting filtered liquid or gas samples, measuring the concentration of particles or droplets using instruments, and calculating the filtration efficiency of the filter bag. For specific particle sizes, such as particles ≥ 5 microns, the filtration efficiency of bag filters can reach over 90%.

Influencing factors: The filtration efficiency is affected by various factors such as filter bag material, pore size, thickness, and the properties of the filtered liquid.

3. Dust holding capacity

Definition: Dust holding capacity refers to the total amount of particulate matter that a bag filter can hold before reaching the specified resistance.

Evaluation criteria: The larger the dust holding capacity, the more pollutants the filter can handle before replacement, reducing the frequency and cost of replacing filter bags.

Influencing factors: The dust holding capacity mainly depends on factors such as the material, structure, and filtration area of the filter bag.

4. Chemical compatibility

Definition: Chemical compatibility refers to the chemical stability between a bag filter and the medium being processed.

Evaluation criteria: Good chemical compatibility can ensure that the filter will not be damaged or affect the filtration effect when handling corrosive or special media.

Influencing factors: The material of the filter bag is a key factor affecting chemical compatibility. For example, PTFE filter bags have high corrosion resistance and good high temperature resistance, making them suitable for filtering corrosive and high-temperature liquids.

5. Service life

Definition: Service life refers to the time or amount of medium that a bag filter can continue to operate under normal usage conditions.

Evaluation criteria: Long service life means that the filter is more economical and durable. The service life is affected by various factors such as filter bag material, filtration conditions (such as temperature, pressure, flow rate, etc.), and maintenance.

6. Convenience of operation

Definition: Operational convenience refers to the ease of installation, replacement of filter bags, and maintenance of bag filters.

Evaluation criteria: Filters with good ease of operation can reduce usage costs and maintenance difficulties. For example, bag filters usually have the characteristics of simple structure and easy replacement of filter bags.

Above, evaluating the filtration effect of bag filters requires comprehensive consideration of multiple aspects such as filtration accuracy, filtration efficiency, dust holding capacity, chemical compatibility, service life, and ease of operation. In practical applications, suitable bag filters can be selected according to specific needs and conditions to achieve the best filtration effect.