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Renewable biomass from forests and fields can be transformed into various forms of fuels, such as ethanol and biodiesel, but also valuable chemicals. The way in which biomass is transformed into a gasification reactor determines the efficiency of the process and the presence of ash in these fuels is essential to understanding the process.
Sources of carbon neutral raw materials are refined by gasification. How to design gasification reactors capable of operating efficiently and competitively with biomass as a fuel source is a major challenge.
Trying to understand the ashes
"My thesis shows that it is possible to describe the rate of fuel conversion in the reactor using fast cameras instead of trying to extract particles, which can be difficult when temperatures rise. The conversion rates and other characteristics such as speed, size and shape can be applied to the computer simulation of new reactors, which is a much faster and cheaper way than construction of many test reactors, says Per Holmgren.
For example, how does the fuel circulate in the reactor, how do ash build up and accumulate in the reactor, how does ash and fuel affect each other, and how does ash affect the reactor? 39, inside the reactor, says Per Holmgren.
Ash is still a problem
One of the goals for the future is to be able to use parts or residues of plants, such as biomass fuel, considered otherwise unprofitable or technically complex. What often causes a puzzle is the problem of the problem. Different forms of biomass also have a great variation in their chemical composition, especially with regard to the ash-forming elements of the fuel. This composition is also very different from coal and oil, which is the most common fuel today.
– It is desirable that the fuel be converted quickly so as not to require a reactor as long, but the problem of ashes is that it accumulates and passes through the reactor or attacks in different ways the internal walls of the reactor to break it. In general, the reactors operate at such a high temperature that the ashes melt and run down, but many of the fuels we would like to use provide better ash with a very high melting point. I have particularly sought to reduce this melting point, says Per Holmgren.
The thesis:
Particle conversion and ash formation in powder flames
Contact:
Per Holmgren, 070-284 87 78, [email protected]
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