Page 54 - Industrial plants

the construction of the new plant in order to not POWER AND PERFORMANCES
interrupt the service. The new line is structured in the Input power to the generator 7,91 MW
following functional sectors, as represented in the Power at the generator clamps 7,09 MW
figure.
Plant self-consumption utilities 1,006 MW
Electrical energy net production 6,084 MW
Monsud S.p.A., a construction company operating in
the civil and industrial engineering based in Avellino, Input thermal energy 27,97 MW
has been engaged itself in the development of the Boiler efficiency 83,87 %
executive project, which represents the third and last Combustion efficiency 81,56 %
phase of the design, predicting the engineering of all Gross return of the plant 25,35 %
works and fully defining the actions to be taken. The Net return of the plant 21,75 %
company, founded in 1979 by engineer D. Pierni, is an
expert in metal carpentry and Table 1: Power and efficiency at CTN point
“Particular care has energy systems.
been taken to prevent The implementation of the project dispose of, through the waste-to-energy process, the
the release of dust, has been structured in six phases: fraction with combustible valence contained in urban
the maximization the first one has involved the waste and comparable to the non-dangerous urban
of efficiency and wrecking of some existing buildings, ones downstream the collection differentiated waste.
the recovery and the planting of the yard and all the The process is designed to operate 333 days/year
treatment of process related works; during the second (8000 h/years), with 91% of use rate, to incinerate a
and storm water phase, excavation has been realized quantity of combust waste equal to 61120 Ton/year,
to carry the plans to the right with an average PCI equal to 12180 kJ/kg. The
elevation; in the third phase, superficial and deep combustion line is also capable of operating with
foundation works has been done; the fourth phase has different thermal power waste. In the project phase, an
been characterized by the use of reinforced concrete horizontal boiler solution has been preferred because
for vertical constructions and the start in building the of the higher efficiency of pipe cleaning. The mechanical
main buildings in metal carpentry; the fifth phase has percussion cleaning system, compared to the classical
been dedicated to complete Oxygen level in combustion gases at the outputof the post- 6..8 % (in vol.)
the previous phase and, at the combustion chamber
same time, to install the plants Time spent downstream of the last air injection >2 / 850 sec/°C
and the electromechanical Input air temperature first 140 °C
equipment; the sixth and last
last phase, has been Input air temperature second 24 °C
destinated to the external Waste-heat load 27,9 MW
3
arrangements and fixtures. For Flue gas flow rate 68644 Nm /h
the plants realization, Superheated steam pressure (out of the boiler) 50 bar.a
numerous excavations has Superheated steam temperature (out of the boiler) 410 °C
been performed, for a total Steam production 32,305 t/h
amount of 5640 m3. The most Combustion gas temperature (out of the boiler) 195 °C
relevant ones are referred to a Residue
bunker in the waste hole, at Waste + non-combustible from grate bottom (dry) 0,912 t/h
the furnace-boiler building and
the one hosting the thermal Boiler fly ash 0,0446 t/h
cycle. Particles from ELF 0,101 t/h
Average daily concentration of flue gas pollutants at the chimney
The new line is sized to allow NO X 30 mg/Nm 3
energetical performances PTS 0,75 mg/Nm 3
reported in the following table. SO 2 5 mg/Nm 3
1. HCI 3 mg/Nm 3
HF 0,4 mg/Nm 3
Other main functional features NH 4 mg/Nm 3
3
of the plant at the CTN are CO 15 mg/Nm 3
reported in the table 2.
COT 3,5 mg/Nm 3
The function of the plant is to Table 2: Operating characteristcs at the CTN point

IndustrIal Plants - May 2023
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