Ask the Cremation Doctor


The “Greening of Cremation” Part III
August 12, 2010, 12:52 pm
Filed under: Green Cremation, Technical Issues

Opacity Controls
The last post stressed the importance of controlling the temperature in the secondary chamber. Closely related, another thing that keeps cremation equipment running clean involves monitoring the opacity of the final stack emissions. If everything is running properly and the temperature of the after chamber is on target at 1400˚F (670˚C), there should be no visible smoke coming from the stack. When things get out of whack, particulates increase causing the emissions to “thicken up” and become visible.

Opacity controls have optical sensors that can be positioned in the stack to watch for these excess particulates and give the operator a head’s-up when something is amiss. Some advanced systems can take corrective action adjusting the fuel/air mix and solving the problem sans an operator in a matter of seconds.  

The State of Florida recently adopted the requirement of opacity controls on all new cremation equipment beginning early 2007.  The good news is that these systems can be added to most existing and older designs for reasonable cost to the crematory owners.

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