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BULETINUL INSTITUTULUI POLITEHNIC DIN IAŞI
Publicat de
Universitatea Tehnică „Gheorghe Asachi“ din Iaşi,
Tomul LVIII (LXII), Fasc. 4, 2012
Secţia
CONSTRUCŢII DE MAŞINI
DESIGN AND TESTING OF A 50 kW DOWNDRAFT GASIFIER
BY
DANIEL DRAGOMIR-STANCIU ∗ and MARIAN STANCU
1 “Gheorge Asachi” Technical University of Iaşi,
Department of Mechanical and Automotive Engineering
Received: November 22, 2012
Accepted for publication: November 29, 2012
Abstract. The paper presents design, manufacture and testing of a
downdraft gasifier with a thermal output of 50 kW. The constructive solutions
adopted, the main dimensions and the test results are presented.
Key words: downdraft gasifier, design, testing.
1. General Considerations
This gasifier is intended to be a part of on microcogeneration unit with
electrical power of 10 kW. The wood gas generator will be designed for
operation in conjunction with a piston engine. Producer gas, the gas generated
when wood is gasified with air, is the fuel for a piston engine driving an
electrical generator.
Was chosen a downdraught gasifier, in which primary gasification air is
introduced at or above the oxidation zone. The producer gas is removed at the
bottom of the apparatus, so that fuel and gas move in the same direction. The
advantages of downdraft gasiefier are the flexible adaptation of gas production
to load and low sensitivity to charcoal dust and tar content of fuel. The open
top permits fuel to be fed more easly and allows easy access.
Four distinct processes take place in a downdraft gasifier as the fuel
makes its way to gasification. They are: drying of fuel, pyrolysis – a process in
which tar and other volatiles are driven off, combustion, reduction.
∗ Corresponding author: e-mail: ddragomir03@yahoo.com