Wherever there are bogs, this process happens. Higher temperatures encourage complete combustion and result in cleaner emissions (up to 1300 celsius). 1, FutureMetrics, January, 2012 . E.g. Any opinions, findings, conclusions, or recommendations expressed in this publication are those of the author(s) and do not necessarily reflect the view of the U.S. Department of Agriculture. This is how wood or forest act as carbon sink. 2 vis-à-vis the methodology for modeling the carbon cycle. How much CO2 does burning wood for home heating produce? This work is supported by New Technologies for Agriculture Extension grant no. By William Strauss and Laurenz Schmidt. But Drax’s giant wood-burning boilers are fueled almost entirely by 6.5 million tons of wood pellets shipped annually across the Atlantic. On the other hand, if we only use as much wood as can grow again, it is carbon dioxide neutral because it binds as much carbon dioxide during growing as is emits during burning. The heat content or the amount of energy produced when a fuel is burned is mainly determined by the carbon (C) and hydrogen (H) content of the fuel. Particulate emissions can be controlled to acceptable levels with smoke stack equipment such as scrubbers, bag filters, and electrostatic precipitators. Much of the timber is sourced locally, which is raising serious concerns among European environmentalists about whether every tree cut down for burning is truly replaced by a new one. Wood is heterogeneous and exact amount of carbon in 1 Kg of dry wood will vary depending on the species of wood, age of wood etc. Is heating with wood carbon neutral? If fuels are used for electricity generation, carbon dioxide emissions increase with the reciprocal of the power plant efficiency. No. 122 0 obj <>/Filter/FlateDecode/ID[<7D3F3BCEB577F4489DCA1EB5E8DA00F6><192BA14956FEC044B2AECD5922FDB14D>]/Index[101 47]/Info 100 0 R/Length 104/Prev 103534/Root 102 0 R/Size 148/Type/XRef/W[1 3 1]>>stream 147 0 obj <>stream The emissions of most concern are carbon monoxide (CO), carbon dioxide (CO2), sulfur oxides (SOx), and nitrogen oxides (NOx). FutureMetrics research delved into this topic, and may have emerged with an answer. h�b```f``����� �� Ȁ �,@Q���� �/eJ;@R�"7.t%'���Q$8::�:�rp�@u\��@Z�E��2�3~��"� �������͉�|S�*t�����< There is a difference of many years, and even decades, between the immediate emissions from burning residues, and the slow evolution of carbon from natural decomposition. But while burning wood immediately releases carbon, it takes decades or even a century for a replacement tree to absorb the same amount of carbon. If fuels are used for electricity generation, carbon dioxide emissions increase with the reciprocal of the power plant efficiency. Burning the wood reverses this … 0 %PDF-1.5 %���� This equipment is however only cost effective on large commercial-sized combustion systems. 0.0053 metric tons CO 2­ /therm x 10.37 therms/Mcf = 0.0549 metric tons CO 2 /Mcf. When wood is burned, the combustion reaction produces heat and emissions in the form of water, organic vapors, gases, and particulates. Burning wood is not CO2 free; it releases carbon, stored over the previous decades, in one quick burst. On the other hand, if we only use as much wood as can grow again, it is carbon dioxide neutral because it binds as much carbon dioxide during growing as is emits during burning. Uncontrolled emissions from wood combustion are high in PM2.5. To understand whether burning wood at Drax is a smart move for the climate, we need to understand the emissions this will produce. Over time, wood will release its carbon one way or another, though under certain circumstances, it may become sequestered, or locked up for a while. 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