Industrial dust collector pressure difference analysis

In industry dust collector during the operation of the dust collector, the pressure difference is a crucial parameter, which directly reflects the air flow resistance inside the dust collector and the operating status of its filter.

1. The concept of pressure difference

The pressure difference of an industrial dust collector refers to the pressure difference from the dust end (filter end or dirty air static plenum) to the clean end of the dust collector (clean air static plenum). This pressure differential is a measure of all resistance to air flow between the two chambers of the dust collector, typically including losses through the tube sheet orifices, resistance to clean filter media, and resistance to dust collected on the filter media.

2. Factors affecting pressure difference

The size of the pressure difference is affected by many factors, including the following aspects:

Material and quality of filter bag: The material and quality of filter bag directly affect its filtration effect and service life. Poor quality filter bags are prone to clogging, which increases the pressure differential.

Air intake speed: The exhaust gas enters the dust collector too fast, which can easily cause the filter bag to become clogged and increase the pressure difference.

Number and layout of filter bags: Insufficient number or unreasonable layout of filter bags can also cause blockage of the filter bags and increase the pressure difference.

Dust characteristics: The concentration, particle size, humidity and viscosity of dust will all affect the pressure difference of the dust collector. For example, high concentrations of dust will form a thick powder cake layer in a short period of time, reducing the air permeability of the filter element.

Dust cleaning method: Unreasonable dust cleaning method or untimely dust cleaning can easily lead to clogging of the filter bag and increase the pressure difference.

3. Monitoring method of pressure difference

In order to maintain the normal operation of the dust collector and extend the service life of the filter, changes in pressure differential need to be monitored regularly. Commonly used differential pressure monitoring methods include using tools such as Magnehelic® differential pressure gauges, Photohelic® differential pressure gauges or digital electronic pressure drop indicators. These differential pressure gauges usually measure differential pressure in inches of water column, but other scales are also used such as millimeters of water, millimeters of mercury, or pascals.

4. Optimize dust collector performance by controlling pressure difference

By monitoring and controlling differential pressure, the following goals can be achieved:

Extend the service life of the filter: Clean the filter element regularly to avoid damage to the filter element due to clogging, thereby extending its service life.

Achieve energy savings: the cleaning cycle only starts when the differential pressure reaches the high set point and automatically stops when the differential pressure reaches the low set point, saving compressed air consumption.

Reduce total emissions: Through effective cleaning and pressure difference control, ensure that the dust collector always maintains efficient filtration performance and reduces total emissions.

5. Treatment of abnormal pressure differences

When the differential pressure reading is abnormal, timely measures should be taken to investigate and deal with it. Possible exceptions include:

Sudden drop in differential pressure: This may indicate a leak or rupture in the filter element.

Sudden increase in pressure differential: may indicate that the cleaning system has stopped operating or the material discharge device is no longer functioning properly.

Gradual increase in pressure differential: Possibly due to additional resistance to airflow in the dust collector from accumulated dust on the filter element. At this time, the filter element should be cleaned in time.

The pressure difference of an industrial dust collector is an important indicator reflecting its performance and operating status. By regularly monitoring and controlling the pressure difference, you can ensure that the dust collector always maintains efficient filtration performance, prolongs the service life of the filter, and achieves the goals of energy saving and total emission reduction. At the same time, timely handling of abnormal pressure differences is also the key to ensuring the stable operation of the dust collector.