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Report RSE 17000280

Feasibility study of a process for the combined and simultaneous removal ofparticulate and gaseous contaminant from flue gases combustion of biomasscombustion

Results of the feasibility study of an innovative process that incorporates and integrates into a single device both the particulate removal and the abatement of pollutants from biomass combustion, resulting in space saving and reduction of the investment costs. The solution involves the realization of a baghouse providing the placement of the SCR-DeNOx catalyst bed within a suitable basket inserted inside the filter bags, thus preventing the plugging and poisoning of the catalyst bed by combustion particulate.

The production of electrical energy using biomasses as primary energy source is one of the basicmeasures for electrical system de-carbonization, together with the hydroelectric, solar and wind power,with the further advantage, in comparison to solar and wind energy, of being a programmable andflexible source. In our country the use of biomass for electricity production is expanding also thanks tothe incentives given to this production, being biomass included among the renewable energy sources anddetermining, if used as fuel, a reduction of greenhouse gas emissions in comparison to fossil fuels. Thestudies on the environmental impacts induced by the combustion of biomass indicate that their use as afuel in power generation plants may cause the release into the environment of non-negligible amounts ofpollutants (fine and ultrafine particles, nitrogen oxides, polycyclic aromatic hydrocarbons, dioxins) withpotentially hazardous effects on the health of the exposed population.

The aim of the feasibility studyreported in this document, as well as the development and experimentation activities that will follow, isto identify and demonstrate solutions to drastically reduce emissions from solid biomass combustion. These solutions must be easy and cost-effective to realize and operate, in order to be acceptable even for plants of the 100 kWe class. Specifically, the solution for the treatment of biomass combustion flue gases considered in the present study concerns an innovative system where particulate abatement and NOx reduction by Selective Catalytic Reduction (SCR) process are integrated into a single equipment, where the SCR-DeNOx catalyst is located within a suitable basket inserted inside filter bags. In comparison with the traditional arrangement, with separate systems, this solution offers the remarkable advantage of system compactness, resulting in space saving and reduction of the investment and maintenance costs.

In addition, in the proposed solution the SCR-DeNOx catalyst operates in the absence of combustion particulate (filtered by the bags filter), which otherwise may cause plugging and possible irreversible poisoning of the catalytic bed. Moreover, this solution allows to greatly reduce catalyst volume, providing a further reduction of related costs.

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