Fabric/Bag Filters

EFV Ventilation Filters

EFV Fabric Ventilation Filters

These are designed to separate solid particles from the gas flow at silo ventilating and while exhausting small gas quantities up to 9 000 m3/h and under temperature up to 140 °C.

Installation and replacement of bags is done from the service access of the filter through the side door, which is also utilised for the pipe control. EFV fabric filters are delivered to the construction site fully assembled, including a control unit in several optional models.

Filter Design

• Filter without a hopper, which is installed directly to the flange of a silo or to the cover of a conveyer
• Filter with a hopper, with an airtight discharge device and with a supporting steel structure
• Filter with integrated ventilator on the clean gas chamber
• Filter with outlet flange for the connection of the exhaust piping
• Overpressure filter with gas outlet straight into the surrounding environment

EFR Cartridge Filters

Cartridge filters use specially shaped filtration elements for dust separation which, at the given diameter and length have much larger filtration surface. They are used mainly to separate dust at small exhausted volumes of gas, especially for the local separation of dunes, dust transport, silos, exhaustion of very fine dusts, in case of low emission limit requirements and in limited usable space.

Main characteristics

• Large filtration surface at minimal demands on the usable space
• Low flue dust emissions (up to 1 mg/m3)
• Temperature of exhausted gas and dust at maximum of 80 ° C
• Easy replacement of filtration elements (cartridges)
• Possibility to select various filtration materials

Explosion Proof Filters

Filtration of Explosive Dust

ENVEN Company delivers the fabric filters to separate explosive dusts up to the ST2 class. These filters are used for explosive dusts, like coal and wooden dusts, dusts arising from processing of sugar, corn, plastics, etc.

The filters have a reinforced design and are set with filtration bags with anti - static treatment, explosion membranes and rotary valves, having the ATEX certificate.

In case of an explosion the installed membranes open immediately, enabling the outflow of arisen hot gases into air and therefore prevent larger damage to the filter. After the explosion the fuses of safety membranes and the damaged internal parts of the filter are usually being replaced.

EFP Fabric Filters on-line

EFP Fabric Filters

EFP fabric filters use compressed air to clean the bags – a process called a pulse jet cleaning. They are being used in a wide spectrum of industrial applications, from the small ones for dust removal, e.g. silos, up to the large installations for dust removal from major technological dust pollution sources, such as boilers, blast furnaces and others.

EFP Fabric Filters on-line

EFP fabric filters in the on-line design are used mainly for filtration of easier separable dusts in cement works, lime kilns or in quarries.

The cleaning process of bags runs under continual operation of the filter - on line. Fully automatic control system provides a gradual cleaning of individual rows of bags, depending on pressure drop of a filter or under a firm time mode.

The specific finish and size of on-line filters are designed individually, depending on the gas and dust characteristics and the space possibilities.

Design

• Gas inlet into the hopper
• Side inlet of gas into the filter casing
• Without the hopper, for silo ventilation
• With walk-in plenum
• Double filter with integrated inlet and outlet manifold

Basic Characteristics

EFP Fabric Filters off-line

Fabric off-line filters are used mainly for the filtration of large volumes of gases, very light and fine dusts and everywhere where highly demanding production technology requires long and uninterrupted operation. These filters are used mainly for dust removal technologies in energetics, metallurgy, incinerators, etc.

They are designed as a system of modules mutually interconnected by inlet and outlet ducts. Each module forms an independent filtration unit and is equipped with pneumatically controlled poppet valves at the outlet and manually controlled valves at the inlet. Closing the outlet poppet valve (off-line system) does cleaning of the module at the short-term cut off. The filter cleaning is controlled on the basis of general pressure drop of the filter and the pressure drop of individual modules by a superior level control system that controls gradual shut down and cleaning of individual modules.

Possible revision or repairs do not require the complete shut down of the filter. Individual modules of the filter can be closed from the both sides, cut off from the filtration process and made accessible for any repair. At a breakdown or when exceeding the maximum entry temperature, the integrated by-pass piping provides for the filter protection.

Basic characteristics