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Valutazione di un gruppo di generazione integrato per la città di Milano costituito da un ciclo combinato e da un termovalorizzatore

pubblicazioni - Articolo

Valutazione di un gruppo di generazione integrato per la città di Milano costituito da un ciclo combinato e da un termovalorizzatore

1 ABSTRACT SUBMISSION 1. I am submitting a paper abstract 2. This paper has not been previously presented 3. This paper is best suited for: First choice: Theme 4 Second choice: Theme 5 4. Primary contact (non author): Name: Carlo G. De Michelis Job title: Project Manager Company: CESI S.p.A Full address: Via Rubattino 54, 20134 Milano – ITALY Tel.: ++39 – 02 – 2125 4797 Fax: ++39 – 02 – 2125 5021 e-mail: demichelis@cesi.it Speaker (author): Name: Massimiliano de Carli Job title: Expert in Power Generation Technologies Company: CESI S.p.A Full address: Via Rubattino, 54 – 20134 Milano – ITALY Tel.: ++39 – 02 – 2125 4768 Fax: ++39 – 02 – 2125 4790 e-mail: decarli@cesi.it Author: Name: Stefano Consonni Job title: Professor Company: Politecnico di Milano Full address: Piazza Leonardo da Vinci, 32 – 20133 Milano – ITALY Tel.: ++39 – 02 – 2399 3917 Fax: ++39 – 02 – 2399 3940 e-mail: stefano.consonni@polimi.it PUBBLICATO A5032561 (PAD – 675361)

CESI POWER-GEN EUROPE 2005 PAPER ABSTRACT 2 Author: Name: Giovanni Lozza Job title: Professor Company: Politecnico di Milano Full address: Piazza Leonardo da Vinci, 32 – 20133 Milano – ITALY Tel.: ++39 – 02- 2399 3906 Fax: ++39 – 02 – 2399 3940 e-mail: giovanni.lozza@polimi.it Author: Name: Ennio Macchi Job title: Professor Company: Politecnico di Milano Full address: Piazza Leonardo da Vinci, 32 – 20133 Milano – ITALY Tel.: ++39 – 02- 2399 3907 Fax: ++39 – 02 – 2399 3940 e-mail: ennio.macchi@polimi.it Author: Name: Dante Salimbeni Job title: Project Manager Company: AMSA Full address: Via Olgettina, 25 – 20132 Milano – ITALY Tel.: ++39 – 02 – 27298 675 Fax: ++39 – 02 – 27298 680 e-mail: salimbenid@amsa.it

CESI POWER-GEN EUROPE 2005 PAPER ABSTRACT 3 5. Title of the abstract: Evaluation of an integrated power plant for the city of Milan consisting of a combined cycle and a waste-to-energy system 6. Table of contents a) High temperature corrosion limits maximum temperatures of superheated steam in Waste-to-Energy plants, whose efficiency is consequently limited as well. b) The integration with a high efficiency combined cycle allows to increase steam temperature at the turbine inlet, with positive effects on global efficiency. c) If the integrated plant is cogenerative and used for district heating, the total balance of emissions for the proposed project is favourable. d) The integration of the two plants either on steam side or on air / gas side is described. The performance and economical aspects of the integrated plant vs. the two separate plants are compared and discussed. e) The discussed solution refers to the case study considered for the city of Milan. f) Conclusions

CESI POWER-GEN EUROPE 2005 PAPER ABSTRACT 4 7. Abstract The integration of a Combined Cycle (CC) Power Plant with a Waste-to- Energy Plant (WTE) allows positive synergetic effects. This paper illustrates an integrated CC + WTE project with its options, tailored to the city of Milan (Italy). The objective is to recover energy from Municipal Solid Waste (MSW) with high energy efficiency and low emissions. Waste-to Energy Plants often experience problems with high temperature corrosion in the furnace and in the superheater. For this reason, steam is usually generated at a temperature which does not allow high efficiency cycles. Superheating in a CC can overcome this limitation, and higher efficiencies can be reached. Therefore, saturated steam generated in three large-scale grate combustors is exported to and superheated in the Heat Recovery Steam Generator (HRSG) of a gas-fired CC, and finally expanded in a common steam turbine. In the project presented in this paper, at least part of the low pressure steam is bled from the turbine to feed a large district heating system serving the southern area of Milan. The integration may concern also the air / gas circuits, since exhaust gas at the HRSG’s outlet, still with a high content of oxygen, can be introduced in the waste furnace, thus saving air preheating and allowing a better control of MSW combustion. Being located in an urban area, both the CC and the WTE plants are equipped with advanced Selective Catalytic Reduction (SCR) systems for NOx abatement. When considering the benefit of replacing domestic boilers with district heating, the overall NOx emissions insisting on the urban area are much lower than those one would have with a conventional, non- integrated, non-cogenerative WTE plant. The paper discusses the choice of the optimal cycle configuration, size and operating parameters, as well as the issues related to part-load operation and shut-downs of either the CC or the grate combustors. Results quantify the overall benefits in terms of energy consumption, emissions of macro- and micro-pollutants, emissions of greenhouse gases. A simplified economic analysis also gives preliminary indications on the convenience of the financial investment.

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