Between 5% and 30% of the energy content of wood escapes up the chimney as smoke. At Clariant (and predecessor company Süd-Chemie) we‘ve been studying the problem of wood heating efficiency for more than thirty years.
Clariant EnviCat LongLife Plus Combustors provide economical and environmental solutions for the burning of wood as a source of heat. These catalytic combustors offer many of the unique properties that have made Clariant catalysts the premier choice for catalytic converter systems for more than three decades. Clariant has developed the optimum chemistry to formulate a catalyst that yields the lowest emissions and longest life of any catalyst in the world. Our combustors are available in a variety of designs for wood burning stoves. When it comes to designing new catalytic wood stoves, our engineers can work with you to develop the optimum shape and size for your stove.
Non-Catalytic Wood stoves burning at low or medium level typically send smoke, and dangerous carbon monoxide up the chimney, as the secondary combustion chamber is simply not hot enough for complete combustion. In a catalytic stove, when the smoke passes through a Clariant catalytic combustor, the incineration temperature of the smoke and carbon monoxide is reduced dramatically.
Thus the energy stored in the smoke is incinerated, even at low temperatures, creating and releasing more heat via radiant-heat transfer.
Gases and particles in smoke contribute to air pollution. The combustor eliminates 90% of wood stove pollution by burning these gases and particles before they exit the stove. Clariant brings thirty years of research and development experience in the field of emissions control to catalytic combustors for your wood stove.
We have developed a product that extracts more heat from burning wood while reducing creosote buildup. Condensation of smoke in chimneys and flues creates creosote, the primary cause of chimney fires. The combustor reduces this danger because it burns most of the smoke and reduces creosote accumulation as much as 90%.
However, you should continue to inspect your chimney regularly for safety!
In the controlled-combustion (or airtight) stove, control of heat output is gained at the expense of combustion efficiency, especially during low burn rates, which leads to excessive smoke and poor combustion efficiencies (50% to 70%). To overcome this problem, draft regulators, secondary combustion chambers, and baffling are often used to improve combustion efficiencies. However, these methods typically fall short during medium and low burn rates because of difficulty in maintaining temperature and air/fuel ratio.
The catalytic combustor allows higher heat-transfer efficiency at low burn rates. This is possible for two reasons: First, a useful byproduct of catalytic oxidation is heat. Elevated exhaust-gas temperatures will enhance the amount of heat transferred by an appliance to the surroundings. Second, the combustor is the most effective at low burn rates. When low flow conditions exist, there is more time for the transfer of heat from hot exhaust gases through the stove
There are three types of catalyst carriers offered for woodburning applications: Two types of ceramic (cordierite and mullite), and metal (stainless steel). However, they do not perform the same in every wood-stove and appliance application.
All ceramic substrates have similar physical characteristics regarding thermal mass or geometric substrate area. Fundamental differences can be discovered when metal substrates are used:
The carrier made of metal foil, which leads to thinner walls, lower thermal mass, lower temperatures required to activate the catalyst, faster heat-up. More geometric surface area for increased catalytic activity: basically smaller catalysts with higher performance.
Clariant offers all of these options and can advise on the best fit for your application.