Fabric filters

Hamon fabric filter systems are a major component of a long tradition of excellence. We combine more than 40 years of experience in fabric filtration including the latest approaches in low pressure high volume pulse jet filters as well as more conventional technologies such as medium pressure pulse jet filtration.

Our engineers have designed and constructed fabric filters for a variety of applications, including cement, coal fired steam generators, stoker fired boilers, fluidized bed combustion boilers, municipal waste incinerators, cogeneration facilities, and industrial processes such as steel, rock products, aluminum, etc.

A fabric filter system is very effective at the collection of fine particulates and metals. By using the appropriate fabric filter design (reactor type) and with additional sorbents injection upstream the fabric filter, air toxics such as SOx, mercury, dioxine, ... can be collected with substantially high efficiency. This principle is used by the Dry FGD (Flue Gas Desulfurization) and Semi-Dry FGD systems. In fact, the SOx, and other pollutants, capture takes place across the filter cake of the fabric.This type of fabric filter will be used for dedusting and the capture of many other pollutants.

Hamon Air Quality System Business Unit can supply several Fabric Filter technologies:

  • Low pressure high volume Fabric Filter (LPHV) that is working without compressor and optimized for large utilities
  • Medium or high pressure Pulse Jet Fabric Filter
  • Reactor Fabric Filter

Unobstructed Tubesheet

Once the compartment is isolated, purged and has cooled, the HR-C LPHV design provides simple, direct access to the bag filters. Since the rotating cleaning arm design does not obstruct the tubesheet, service activities are easily performed.


HR-C’s low pressure high volume cleaning system, delivers cleaning pulses through a rotating cleaning assembly located on the roof of the compartment. This design allows as many as 1600 filter bags to be leaned from one mechanism (one pulse valve and air tank), which distributes pulses to all of the bags through the 1 rpm rotation of the cleaning arms. This arrangement greatly reduces the number of electromechanical devices in the system, eliminates stationary pulse pipes (above rows of bags in other designs) and simplifies both initial installation and long term maintenance.

In the HR-C LPHV design, bags are arranged in a layout of concentric rings, below the rotating cleaning arm pulse nozzles. The oblong bag/cage shape works with the cleaning system geometry. The oblong shape improves the ratio of internal volume to filter surface, and requires less pulse energy for effective cleaning. The oblong shape also yields an improved can velocity allowing for better dust fallout into the hoppers.

The HR-C LPHV cleaning air is supplied by positive displacement blowers at 8 to 12 psig. Blowers are generally lower maintenance devices compared to compressors and use less energy to produce the required cleaning air.

Maintenance and Access

With respect to fabric filters, the key area to be considered is inspection and maintenance of the filter bags which are accessible at the fabric filter compartment tubesheet after a compartment is isolated.

HR-C’s typical compartment isolation arrangement for filter bag maintenance, used in approximately 95% of installations) is a “walk-in plenum design” with outlet poppet dampers and low leak inlet louver dampers. This basic design allows ease of entry and egress at the tubesheet level.

Long Filter Bag Service Life and Low Emissions

Many of the HR-C fabric filter installations have achieved better than five years bag life, while at the same time providing very low particulate emissions. As a result of this experience, HR-C is able to confidently offer industry leading performance guarantees for pressure drop, emissions and bag life.

ESP to FF Conversion

The HR-C LPHV design lends itself to the conversion of existing ESP to Fabric Filters. HR-C’s first of many ESP to FF conversion projects was implemented in the mid 1990s. ESP to FF conversions can offer significant project savings as ductwork and ash handling systems can be retained and in many cases existing ESP casing walls can be reused.