Page 46 - Industrial Plant 2020

value are influenced by sources outside the fume
treatment line.

6 years later
The plant has been operating since 2012, and has
been subjected to regular maintenance to keep
performance levels under legal limits. However,
performance has been well above expectations.
Residual emissions did not only remain consistently
below legal limits, they were also extremely low, similar
to or even lower than those found during the
performance test.
After six years of operations, the Lomellina Olevano
power plant has always operated within the stringent
legal limits for emissions. It also demonstrated excellent
performance in terms of reliability, since it has required
only downtime for ordinary maintenance, guaranteeing
an average of 8,350 operation hours per year.
Table 2 illustrates the residual emissions at the chimney
after an operating period of about 6 years. In addition
to the excellent results in reducing Nitrogen oxides, we
also want to highlight the residual emission of dust at
only 70 micrograms per cubic metre, which is 70-fold
less than the authorised limit value, and almost 150-fold
less than the limit established by EU standards!
The plant has also demonstrated excellent performance
in terms of reliability, since it has required only downtime
for ordinary maintenance, guaranteeing a mean of
8,350 operation hours per year.

Conclusions

Boldrocchi provided complete air pollution control and
noise protection solutions for this biomass plant.
Analyses shows complete success: air pollutants have

Emission limits Emissions after
Pollutant in combustion Emission limits According to Local 6 years operation
flue gas [mg/Nm ] According to EU Norms
3
Authorization (daily average) [mg/Nm ]
3
Dust 10 5 0,07
CO 50 50 14
TOC 10 10 0,4

NOx as NO 200 70 42,3
2
NH 10 5 1,2
3
SOx as SO 50 10 0
2
HCl 10 5 0,2
HF 1 1 0
Sound pressure at plant fence

Sp dB (A). 60 54,1

Table 2: Emissions measured after 6 years of operation

IndustrIal Plants - May 2020
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