EXHAUST GAS CLEANING FOR PRESS EXHAUST GASES

Scheuch-exhaust gas cleaning for press exhaust gases

Press fumes are often responsible for the development of strong odors and other contamination in the discharge area of the press, particularly in the case of continuously operating presses in the wood based panel industry. Because extraction takes place in part only via the pressroom’s ventilation system - above all in the case of existing production lines - there is usually a need to improve existing equipment. Another factor in the case of new press installations is the existence of many different extraction points. The processes SAP and ESAP achieve significant improvements both for existing presses and new presses awaiting installation.

The SAP Process

The SAP process proceeds as follows:

Fume collection and wetting with process water
Fumes are extracted directly at the press discharge area using specially constructed extraction hoods; process water is injected directly into the extraction hood. The exhaust gas is separated from the water stream immediately thereafter. The process water is collected in a collection tank and then pumped to a process water cleaning station.

Pre-filtration in a tangential solid matter separator
The water droplets and particulate matter still contained in the gas stream are removed almost in their entirety in the tangential solid matter separator. The pre-cleaned gas can then be fed to the final treatment stage using longer pipe systems than would be possible without pre-filtration.

Process water treatment
The process water is pumped into a settling basin via a large particle screen that removes solid matter. Continuously discharging small amounts of water further stabilizes the water quality, ensuring long-lasting and problem-free operation.

The ESAP Process

Filtration via an optional wet electrostatic precipitator module Filtration via an optional wet electrostatic precipitator module
In the absence of a final cleaning stage - for example, a SEKA wet electrostatic filter or a SABA bio-scrubber - or if long pipe connections are uneconomical, the solid matter separator in the SAP system can be optionally replaced with a wet electrostatic filter module. This ESAP process is able to meet the demands placed on a final-stage cleaning system by offering the best possible particle and blue haze filtration.

To be able to meet the ever increasing demands placed on such systems in the future, Scheuch is at work today on the system integration of yet other modules that will offer high filtration rates for formaldehyde, methanol and other relevant emissions.