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MAN - Pyrolytic Oven - REV: Original | C. System Overview
C.2 General Overview
Use
The Pyrolytic Oven is designed to clean glass or metal parts contaminated with residues of various organic
substances such as polymers, waxes, resins, asphalts, tars, or other similar contaminants. Cleaning is done entirely
with heat, eliminating the use of solvent or chemical cleaning. Organic residues are thermally decomposed and
vaporized from glass or metal parts at 900 degrees F. Virtually all types of heat-resistant glass and metal parts can
be cleaned in the oven. As long as the heat will not hurt the parts being cleaned, and the residues to be removed
are organic and can be removed thermally, the Pyrolytic Oven is a suitable alternative to solvent and chemical
cleaning methods.
How it Works
1. Heat Decomposes and Vaporizes Organic Residues from the Glass or Metal Parts
The Pyrolytic Oven is a high-temperature oven capable of operating at 800-1000 degrees F. This temperature is
sufficient to thermally decompose (vaporize) most polymeric residues and other organic material to volatile gases
and carbonized residues without harming the glass or metal parts. The pyrolysis smoke and gases produced by
degradation of the organic residues reacts with a catalyst suspended in stainless steel wire mesh which comprise of
two racks (trays) inside the oven chamber. If sufficient smoke or pyrolysis gases are produced inside the oven, the
oxidation of this smoke will consume oxygen inside the oven and actually inert the oven to a very low oxygen level of
one to two percent.
2. Pyrolysis Smoke and Gases are consumed by Electric/Catalytic Oxidizer (Afterburner)
Any un-reacted pyrolysis products formed inside the oven exit through a pipe at the top of the oven and passes
through a small Oxidizer chamber which sits on top of the oven. The Oxidizer is a combination electric/catalytic
system which preheats the oven exhaust gases to 1300-1500 degrees F with excess air before they pass through a
honeycomb ceramic catalyst which completes any oxidation not occurring in the preheat zone of the chamber. This
pollution control method is very effective at destroying any smoke and odor produced during the cleaning process.
The exhaust gases from the oxidizer chamber are mixed with fresh air, resulting in a pollution-free exhaust at
temperatures of 130-160 degrees F.
3. Final Cleaning is accomplished by the Oxidation Stage.
The heat-cleaning process actually consists of two distinct stages. The first stage is the pyrolysis stage described
above. The second stage consists of oxidation of any carbonized residues produced during the first, pyrolysis stage.
Virtually all organic materials produce some soot-like, carbon residues on thermal decomposition. Injecting air into
the 950 degree F oven chamber during the final cleaning stage oxidizes carbon residues, leaving the glassware or
metal parts completely free of any organic matter. Ash or other inorganic material is left behind) on the parts and
can be washed off with water.
Parts That Can Be Cleaned
Any part which the normal cleaning temperature of 800-950°F will not hurt can be cleaned in the oven. Laboratory
glassware, particularly the heat resistant types are easily cleaned without damage or distortion. Ceramic parts
which can tolerate the heat can also be cleaned.
Summary of Contents for Pyro-Clean
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