Pulse Jet Valve

Pulse Jet valve:

Pulse jet valves are used in filtering systems of dust collectors, gas turbines, and desulfurization equipment. They are commonly used to clean filters such as cartridge filters, envelope filters, ceramic filters, and sintered metal fiber filters. Here, we discuss how these valves work in a typical application for dust collector systems.

Dust Collectors Overview

Dust collectors are systems used to either remove granular solid pollutants or recover valuable solid or powder from exhaust gases prior to venting to the atmosphere. A dust collector usually consists of a blower, dust filter, a filter cleaning system and a dust removal system. One of the most efficient and cost-effective dust collectors available is a fabric collector commonly known as a baghouse.

In a baghouse, particle-loaded gas is passed through fabric bags depositing dust on the outside surface of the bag (Figure 1). To keep the pressure resistance of the baghouse within a pre-set range, and thus ensure the dust collecting efficiency of the baghouse, bags are cleaned constantly. The most commonly used filter cleaning method is called pulse jet or pressure jet.

In this method the dust is removed by a high-pressure blast of air that enters the top of the tubular bag filter (1), see figures 1 and 2. A pulse jet valve (2) feeds pulsing air through a blow pipe (3) which consequently feeds nozzles located above each bag (1). This will create a shock wave that passes through the bag and causes the bag to expand which shatters the dust cake accumulated around the bag. Although this pulse of compressed air temporarily stops the flow of air through the filter tube bag, due to its rapid release, the flow of particle-loaded gas into the baghouse is not interfered. Therefore, pulse jet cleaning baghouses can operate continuously.