The difference between offline cleaning and online cleaning of the dust collector

1, dust collector online cleaning

High-pressure pulsed air is ejected from the injection hole through the air pipe at a high speed from the electromagnetic pulse valve, through the venturi neck above the dust bag, including the inhaled secondary air, and flushed into the interior. Filter the bag along the length of the filter bag. The short pulse pressure wave strips the dust deposited on the surface of the filter bag, the dust falls into the ash hopper, and the cleaning gas passes through the clean room to remove the machine. When the solenoid valve is de-energized, the pulse valve diaphragm closes and stops the high pressure pulsed air flow, and the cleaning is completed once.

The problem with online cleaning is that the high-pressure pulsed air creates a high-pressure airflow opposite to the main airflow, thereby filtering the filter bag, thereby shaking the filter bag, removing dust collected on the surface of the filter bag, and dust falling into the ash hopper located in the lower part of the dust collector. in. In the middle, the discharge device is discharged to the outside of the machine. During this process, the high pressure pulsed air must overcome the resistance of the primary airflow and its strength must be reduced. The effective filter area of the dust collector is also reduced instantaneously (in milliseconds). From an industrial perspective, the impact of reduced area on the process system is negligible. In recent years, dust collectors for online cleaning methods have been widely used in various industrial places where welding fumes and dust are flying.

2, dust collector offline cleaning

Off-line cleaning requires the design of a dust collector in a multi-chamber combination for room-by-room cleaning. When it is desired to clean the filter chamber, the filter chamber is isolated from the main air flow and the filter chamber is isolated by a valve provided at the air inlet or outlet. This process is maintained for about 2 to 3 minutes. As a result, the total filtration area (or total filtration area) of the precipitator during each cleaning operation will reduce the filter cloth area of one chamber, and the reduction in total filtration area will also result in an effective filtration area (or net filtration). The reduction in area is clearly uneconomical, increasing investment in infrastructure and not meeting the wishes of the owners. In this regard, it is not as good as cleaning online. However, it is technically advantageous to clean the filter bag from the main gas stream:

(1) The high-pressure pulsed air passing through the filter bag does not have to be large to effectively clean the dust, and the required pressure is also low.

(2) The dust removed from the surface of the filter bag has enough time to fall into the hopper and is less likely to scatter again.

(3) Reduce the frequency of cleaning and extend the life of the filter bag.

(4) Configure a small number of pulse valves to reduce investment and maintenance workload.

(5) The amount of compressed air required for cleaning is small, saving energy.

(6) The cleaning efficiency is high, and the dust collector can maintain a low pressure drop. As a result, the operating cost of the dedusting system is reduced.

The above is what Xiaobian has shared for you today. If you want to know more, please pay attention to the official website of Yongming Machinery or online consultation.

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