Page 43 - Industrial Plant 2020

lobal pollution has increased • Dust particulates were lowered to 0.16 mg/Nm ,
3
exponentially through the years, including fine particulate matter (PM )
2.5
and all the latest environmental • Noise down from 67 dB (A) to 54.1 dB (A), well
studies have clearly shown the under the stated objective of under 60 dB (A).
devastating effects this pollution
Gcan have on both nature and human The Olevano Power Plant is designed to deliver 140
health. Environmental organization/groups Worldwide GWhe per year of renewable energy, sufficient to meet
including the populations living in these polluted areas the needs of about 50,000 families, and consumes
have raised their voices, and governments have approximately 200,000 tons/year of wood chips
implemented increasingly stringent regulations. (coming from Short Rotation Foresty).
Very strict Flue Gas Treatment Regulations have been The plant has the following characteristics:
applied by many of the worlds environmental bodies • Nominal Heat Output: 64 MWt
and countries to both biomass and energy sectors but • Gross Power: 20 MWe
still companies are preparing for the implementation of • Net Power: 18 MWe
even stricter environmental laws soon. • Grate furnace
Furthermore, the standards that regulate legally defined • Superheated steam Rankine Cycle
noise limits (for each class of intended use) set • Steam conditions at the inlet of the turbine 525
constraints on noise production to achieve reduced °C, 92 bar(a)
noise pollution in the area surrounding the plant. • Air-cooled condenser
Hence, in order to assess the sustainability of a project,
it is important to know the impact of these emissions Like any other biomass plant, the combustion generates
produced by the plant, no matter whether these particulate, nitrogen oxides, volatile organic compounds
emissions are related to chemicals generated from and a consequential increase of noise pollution.
combustion and released into the atmosphere, or to Boldrocchi was commissioned by the Customer to
sound produced by machinery located inside the plant. achieve two groups of objectives:
• Residual emissions of polluting compounds: NOx
In order to assess the project <70 mg/Nm3, SOx < 10 mg/Nm3, HCl < 5 mg/
sustainability, it is important to know Nm3, Dust: < 5 mg/Nm3 (dry values, referred to
the impact of the emissions produced 11% of O2);
by the plant, both with respect to the • Average equivalent level of A-weighted sound
chemicals released as well as to the pressure: at the fence, equal to: ≤ 60 dB(A) –
sound produced by the machinery Daytime/ Nighttime; at 1 m from the outlet of the
fumes extraction chimney (spherical measurement),
For the Electric Power Station Lomellina Olevano, equal to: ≤ 67 dB(A) – Daytime/Nighttime
southwest of Milan, Boldrocchi devised a technical plan
to reduce air pollutants and noise emissions to Boldrocchi’s highly trained engineering teams devised a
extremely low levels (less than 1 mg/Nm3 of particulate
matter) – among the lowest emissions in biomass
power plants in Italy.

The Case

Since its inception in 1909, Boldrocchi has continued to
seek better solutions for its customers. In 1914, before
most countries had even introduced environmental
emission legislation, Boldrocchi started to sell air
filtration equipment to reduce fumes in and around
plants.

The installation at Olevano di Lomellina is amongst the
most impressive results of Boldrocchi as the FGT
system measured the following abatement results:
• SO emissions were lowered to 0.00 mg/Nm 3
2
• HCl emissions were reduced to 0.02 mg/Nm 3
• NO emissions were decreased to 46.04 mg/Nm ,
3
X
well under the legal limit of 70.00 mg/Nm .
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IndustrIal Plants - May 2020
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