Pulse-jet valves are utilized in filtering systems of dust collectors, gas turbines, and desulfurization equipment. they're commonly wont to clean filters like cartridge filters, envelope filters, ceramic filters, and sintered metal fiber filters. Here, we discuss how these valves add a typical application for dust collector systems.
Dust Collectors Overview
Dust collectors are systems wont to either remove granular solid pollutants or recover valuable solid or powder from exhaust gases before venting to the atmosphere. A dust collector usually consists of a blower, dust filter, a filter cleaning system and a dust removal system. one among the foremost efficient and cost-effective dust collectors available may be a fabric collector commonly referred to as a baghouse.
In a baghouse, particle-loaded gas is skilled fabric bags depositing dust on the surface of the bag (Figure 1). to stay the pressure resistance of the baghouse within a pre-set range, and thus make sure the dust collecting efficiency of the baghouse, bags are cleaned constantly. the foremost commonly used filter cleaning method is named a pulse jet or pressure jet.
Pulse-jet valves are indirect operated solenoid valves specially designed for dust collector systems. When the solenoid is energized, trapped air above a diaphragm is quickly exhausted causing a high-pressure difference across the diaphragm. Thereby the diaphragm is suddenly opened. When the solenoid is de-energized, air escapes through a hole to the chamber above the diaphragm which balances the pressure and instantly closes the valve.
The fast opening and shutting of the valve are of great importance for the effective cleaning of filters and therefore the economical consumption of compressed gas. this is often made possible by keeping the load of the moving parts small and thus having small inertia. These valves have very high kV values. the utmost flow is reached when the air velocity becomes sonic (344 m/s).
Main parameters that affect the choice of pulse jet valves are as follows:
Tank volume: the quantity of air volume stored within the supply tank which successively depends on valve size.
Tank pressure: The atmospheric pressure within the tank which is additionally the inlet pressure of the valve.
Max allowable pressure: Maximum line or system pressure for safe operation.
Electrical pulse length: The time during which the valve is energized.
Total pulse length: The time between when the valve opens and when it closes.
Peak pressure: the utmost pressure reached the top of the blowpipe which creates the blast wave.
Pressure drop tank: The difference between the tank pressure before and after the blast wave . to take care of sonic flow within the blowpipes, it's necessary to limit pressure drop to a maximum of fifty of absolutely the tank pressure. In an installation, it's the simplest thanks to reducing the electrical pulse time if the pressure drop is just too high.
Performance ratio: The ratio between tank pressure and peak pressure in percentage. the quantity of this parameter depends on the kV of the valve and therefore the opening time.
Volume per pulse: the quantity of air at air pressure passing through the valve per pulse. The greater this parameter, the higher filter bags are cleaned, and more bags are often cleaned per valve.
These sorts of solenoid valves accompany different choices of the fabric of construction namely of body and of seal material. All materials of construction have specific properties that make them suitable for various applications. it's essential to settle on the acceptable body and seal material for your media.
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