ITK Envifront AB

- Model PFMH-TFAC - Cremation Process Flue Gas Filter

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The PFMH-TFAC filter is specially designed to clean flue gas from cremation processes. It is built to be able to fit in small premises with a low ceiling height and little space. The fabric filter PFMH's task is to clean the flue gas from particles of dust and the bed filter TFAC is composed with active carbon to clean the air from dioxides and mercury.

The task of the active carbon filters is to clean the flue gas from mercury and dioxines. The TFAC filter is placed in the flue after the particle cleaning in fabric filter PFMH.

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  • Precollector
  • Filter housing
  • Cleaning system
  • Filter cassettes
  • Hopper with screw
  • Closing damper TSAB (accessories)
  • Bypass damper TSFA-03 (accessories)
  • Control system CPFA (accessories)

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The gas is led in to the reactor of the filter where bigger particles such as sparks, are separated through the passage in the vertical channels on one of the filters gables. The dust burden air is then led into the flue gas side of the filter housings, passes through the filter sleeves, and is then led out through the clean air outlet.

The filter sleeves are assembled in the so-called filter cassettes. The filter sleeves are regenerated, cleaned, with compressed air thrusts, which shake the filter cloth. The separated dust falls down in to the hopper where a screw conveyor transports the dust to the outlet of the filter and is led out. In the hopper there is also an inspection door.

To prevent the filters sleeves from a high tempered flue gas, the filter housing can be provided with a bypass-system, which leads the flue gas, pass the filter sleeves. The bypass-system consists of a closing damper inbetween the precollector and the filter housing outlet, and a three-way damper, a so called bypass damper on the filter housing outlet.

The filter housing is provided with service doors placed on its clean air side. Through these the condition of the filter sleeves can be inspected and exchanged if neccessary.

The heavy dust is gathered on the bottom of the pre-collector and is manually removed, when neccessary, through cleaning doors.

The cleansing is secured by a cleansing system. This consists of pressure tanks which accumulate compressed air, which via the cleaning valves pulsate out through a air pipe with nozzles in every filter sleeve. In that way it creates a thrust, shake, that cleans the filter sleeve.

The dust collection is performed with a connected dust collection system, SALS, which is then fed out to a standard 208 liter drum. Through a closing damper, changing the drum is possible also durign operation.

Cleaning of the filter, closing-, bypass damper and the screw conveyor is run by a control cabinet with a PLC-control unit of type CPFA, which with help from the sensors in different parts of the plant controls the cleaning.

The filter consists of the following main parts: A filter housing which is built together with the fabric filter. Two steps of cassettes filled with active carbon, where step one handles the Hg- and dioxine cleaning and step two constitutes an extra safety of the dust collection.

  • Each step contains a container where the flue gas is cleaned at the passage from the outside to the inside of the cylinder.
  • The cassettes are filled with a specially adapted granulated active carbon.
  • Cassette plates where the carbone cassettes are fixed. These are intended to be changed 2 times a year

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