The hydrothermal carbonization
Having in previous issues of the oak-chestnut-leaf Linden already different have presented opportunities for the production of biochar (charcoal as renewable plants) is, in today's issue of the method of hydrothermal carbonization are presented.
you all know lignite. Lignite is one of the most effective air fuel at all. In the production of 1 kW / h of electricity occur incredible 1153 grams of CO2. This means that if a manufactured exclusively from brown coal average annual power consumption of a 4-member family of 4500 kwh / year CO2 emissions of about 5.2 tonnes of carbon dioxide.
But what is causing this high CO2 emissions from the lignite?
brown coal is the result of the so-called natural carbonation. This is for several million years of biomass to lignite was converted. Since the biomass removed during plant growth the carbon of the atmosphere, this is now stored as a result of the conversion of brown coal in it. If the brown coal burned, the carbon combines with oxygen in the air to escape as CO2 and climate-efficient gas into the atmosphere.
seems to burn brown coal So strongly negative impact on our climate. But what about when no carbon from brown coal burns, it converts from biomass through chemical processes in coal and escapes in this way the atmosphere the carbon?
This question is the research of Terra Preta, Biochar especially after. As was discussed in previous articles several times on the properties of Terra Preta and Biochar is to be avoided at this point to repeat it again. wish to continue
with the question of how the so-called hydrothermal carbonization (HTC) expires. The HTC mimics the natural carbonation.
The crucial difference between the natural and the artificial methods is the time factor. While the natural carbonation takes several million years, which HTC is complete after a few hours.
The natural process of dehydration (dehydration) and, consequently, the new arrangement of the molecules is accelerated by a high pressure of up to 2 MPa and temperatures of about 180 ° Celsius.
The great advantage of HTC over other methods of Biocharherstellung is the high carbon yield of almost 100%. Also related to the heating value of dry mass energy balance is to be about 40% acceptable, ie, 40% of the information contained in the dry mass energy at the Release process, the rest remains in the formed coal.
are currently testing procedure in which attempts are sent through litigation, is the production of biochar in an unbroken, to run the self-sustaining reaction, so that no external energy must be added out.
A breakthrough in this area would bring a breakthrough in the entire area of the Terra Preta with it. Because: In a self-sustaining reaction to produce carbon biochar could constantly be withdrawn and be given significant contribution to maintaining the 2 ° limit on global warming without an additional expenditure of energy in the atmosphere. Interested
can still submit a plan of the furnace "Anila Stove" from the previous edition by email request from us.
to questions and suggestions, we like to answer under our
e-mail address: terrapreta@web.de
AG Energy and Environment working group Terra Preta
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