The present investigation shows that a 90%
particle removal is easier to achieve than a 90%
tar removal. Except for the catalytic tar crackers,
none of the gas cleaning systems tested so far can
securely meet a tar separation exceeding 90%
and hence new concepts for tar removal are
required. Based on experimental data for the
removal of particles and tars (Table 3), none of
the investigated gas cleaning systems can safely
meet the gas quality requirements for satisfactory
IC engine applications (Table 2). If the postu-
lated gas qualities are assumed as correct, some
operational problems in the IC engine will occur.
Hence, the tar separation is a key issue for a suc-
cessful application of biomass derived producer
gas.
High particle collection eciencies are expected
for dry gas cleaning systems such as high per-
formance fabric ®lters and the rotational particle
separator. For both, the tar reduction is smaller
than in wet gas cleaning systems and hence an
additional tar reduction is required. A tar collec-tion in the range of at least 70% can be expected
with additional tar adsorbers based on activated
carbon. The sand bed ®lter and the wash tower
have already been successfully tested in ®xed bed
biomass gasi®ers coupled to IC engines. For a
®nal cost assessment of the dierent gas cleaning
systems, operating cost based on practical experi-
ence are needed.
The present investigation shows that a 90%particle removal is easier to achieve than a 90%tar removal. Except for the catalytic tar crackers,none of the gas cleaning systems tested so far cansecurely meet a tar separation exceeding 90%and hence new concepts for tar removal arerequired. Based on experimental data for theremoval of particles and tars (Table 3), none ofthe investigated gas cleaning systems can safelymeet the gas quality requirements for satisfactoryIC engine applications (Table 2). If the postu-lated gas qualities are assumed as correct, someoperational problems in the IC engine will occur.Hence, the tar separation is a key issue for a suc-cessful application of biomass derived producergas.High particle collection eciencies are expectedfor dry gas cleaning systems such as high per-formance fabric ®lters and the rotational particleseparator. For both, the tar reduction is smallerthan in wet gas cleaning systems and hence anadditional tar reduction is required. A tar collec-tion in the range of at least 70% can be expectedwith additional tar adsorbers based on activatedcarbon. The sand bed ®lter and the wash towerhave already been successfully tested in ®xed bedbiomass gasi®ers coupled to IC engines. For a®nal cost assessment of the dierent gas cleaningsystems, operating cost based on practical experi-ence are needed.
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