The owner of the greenhouse shows the furnace which they previously used to burn coal to heat their greenhouse, is now incineration grass pellets. The greenhouse owner explains how the furnace running on grass pellets could easily warmth any farm dwelling within the county. He then proceeds to open the bag of grass pellet fuel as well as load it into the hopper on the furnace. He then proceeds to remove and empty the large ash draw, which fits within the furnace direct beneath the burn grate. The hopper has a horizontal auger in the base which will feed pellets up into the burn pot. The owner explains one of the reasons he likes this design of pellet furnace is through the design of the grate. He explain as ash is created the new feed of pellets pushes the ash over the grate, and into the large ash pan below. To ignite the grass pellet furnace either fire starter gel, or in the video a flame torch is used to ignite the fire. A fan then feeds the fire by way of air to achieve an efficient incineration.
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A few minutes after starting the fire, the combustion zone of the straw pellets is around 600 degrees. Using an infrared heat sensor, the owner of the greenhouse shows how proficient the pellet stove furnace is at capturing heat, by way of the chimney gases leaving the smokestack at only around 70 degrees. The chimney gases still necessitate to be hot adequate, so creosote does not form around within the smokestack, as eventually this would choke the furnace. Within a few more minutes the heat of the incineration zone has reached 1000 degrees. At these tempters highly proficient burning is taken place, volatile gases are being burnt off along with no visible smoke. At these temperatures the flame appears blue, similar to a gas flame. As stated within the video, compared to coal, straw pellets are not only a much greener option, there are also a renewable resource. The straw pellets burn cleanly, generate no odour during burning. The owner describes the process of using straw pellets as a win, win scenario for the consumer along with manufacturer of the pellets.
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Combustion grass pellet energy is not as uncomplicated as incineration biomass pellets for instance. On the other hand, despite the issues, combustion straw pellets is definitely worth as the resources are far more abundant than biomass plus straw pellets can be a much cheaper in addition to more available energy source. The three main issues involved in burning grass pellets are increased ash content, likely clinker formations along with increased corrosion risks. Straw pellets create chloride which is a high temperature corrosive, to withstand the increased corrosion risk, the furnace must be either built from stainless steel or heavy grade steel. To deal with the increased ash content plus clinker formations, only certain burn pot designs can remove sufficient ash in addition to also potential clinker formations. The issue is most pellet stoves plus pellet boilers are designed by means of a very basic drop down burn pot. Clinker formations are were the ash reaches a high sufficient temperature to fuse together along with form a solid glass like mass. The PelHeat pellet stove in addition to boiler guide shows which design of burn pot plus extra issues to avoid.
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