Pulse Firing – Part One: A Practical Solution to Furnace Uniformity

pulse firingHappy March to everyone. Spring is around the corner and the days are noticeably warmer. I, for one, am not a “Winter Person” so I am eagerly anticipating Spring’s arrival.

I would like to discuss, briefly, Pulse Firing Technology and the benefits to temperature uniformity in furnace applications. Pulse Firing has been around for many decades now and its benefits are well known and documented. The technology was introduced and perfected in Europe and is most prevalent there. However, here in the United States, it has slowly gained traction since its introduction in the early 1980’s. Manufacturers in the industrial heat processing industry got a slight taste of this, at that time, “new” technology if they had purchased a gas fired furnace from a European Furnace OEM. However, its first successful commercial introduction to the United States by a domestic burner company took place in 1985 via a partnership between Hauck Manufacturing and Krom Schroder.

That initiative was spearheaded by a young Controls Engineer at Hauck by the name of Mike Shay. Mike would, later in his career rise to the position of President of Hauck Manufacturing as well as serve on the Board of directors and President for IHEA. (As an aside, I would be remiss if I did not point out that HEAT Combustion Solutions, LLC is fortunate to have Mike Shay as part of the HCS, LLC Team in the position of Director of Sales and Product Development. GO TEAM!). The first installation of the Hauck/Krom Schroder Pulse Fire system was at American Magotteaux in Pulaski TN. It was successful because the concept of Pulse Firing as it relates to improved temperature uniformity was proven out at this location.

Much has been written over these past years about this combustion control technology and its benefits. How does this technology provide these benefits? Quite simply, it can be described as harnessing the energy provided by a high velocity burner to effectively promote convective heat transfer. The key here is the high velocity burner and its inherent ability to entrain the furnace atmosphere which provides a “stirring” effect of said atmosphere. This “stirring” forces the hot gases to move throughout furnace and as a result the “scrub” against the load. It is this “scrubbing” action, referred to as Forced Convection, that allows for equal transfer and distribution of the heat throughout the load. Forced Convection can be described as the transfer of heat between solids (the load or product) and fluids (hot exhaust gases) by a mechanical means (High Velocity Burner).

Pulse Firing addresses three fundamental issues face by all manufacturers involved in industrial heat processing. These issues are:

  1. Poor temperature uniformity of the furnace (which directly impacts the product uniformity)
  2. Inadequate turndown of the combustion system in total
  3. Excessive fuel consumption

We will address this in the next few articles as I don’t want this to turn into a long drawn out blog post that would give one the feeling of rather having a root canal than reading one more paragraph. This is what I term the Primer for the rest of the series of Pulse Firing blog posts.


I would be remiss if I did not point out that HEAT Combustion Solutions, LLC has much expertise and experience in the technology of Pulse Firing and we are at your beck and call if you would like to entertain a visit. We do a really good Dog and Pony Show and a mean soft shoe.

Until next time, be safe and work safe.


HEAT Combustion Solutions, LLC – we ARE industrial combustion

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