Methodology deExperimental campaigns were conducted in November 2007, in
June 2008, and in October 2009 at the stack of the incinerator inscription
order to estimate the emissions of the waste incinerator in terms
of particle number concentration. In the present paper the results
of the experimental campaign carried out in October 2009 are discussed
as in that period also morphologic and chemical analyses
were performed. Aerosol emitted from these combustion sources
are typically hot, highly concentrated and made up of volatile gaseous
compounds which tend to condense either homogeneously to
create nucleation mode particles or heterogeneously onto solid
particles as the exhaust gas cools. Besides, highly concentrated aerosol
could lead to coagulation phenomena among particles. Hence,
it is necessary that exhaust emissions have to be properly diluted
and thermally conditioned otherwise the particle size distribution
and concentration could quickly undergo significant changes between
the source and measurement instrument (Hüglin et al.,
1997; Burtscher, 2005). Therefore an ad-hoc design of the sampling
system was made up in order to control the condensation and
nucleation processes in the tract connecting the stack and the
Rotating Disk entrance as reported in Fig. 1. A sketch of the complete
sampling line employed in the measurement campaign is
represented in Fig. 2 where aerosol temperature profile during
the sampling line is also reported to emphasize the importance
of the thermal conditioning throughout sampling procedure. From
the Fig. 2 comes out that the aerosol, after a two-step thermodilution
process by flowing through the Rotating Disk Thermodiluter
and the Thermal Conditioner, can be sent to a CPC or an SMPS
depending on whether particle number concentration or size
distribution were measured.
Methodology deExperimental campaigns were conducted in November 2007, inJune 2008, and in October 2009 at the stack of the incinerator inscriptionorder to estimate the emissions of the waste incinerator in termsof particle number concentration. In the present paper the resultsof the experimental campaign carried out in October 2009 are discussedas in that period also morphologic and chemical analyseswere performed. Aerosol emitted from these combustion sourcesare typically hot, highly concentrated and made up of volatile gaseouscompounds which tend to condense either homogeneously tocreate nucleation mode particles or heterogeneously onto solidparticles as the exhaust gas cools. Besides, highly concentrated aerosolcould lead to coagulation phenomena among particles. Hence,it is necessary that exhaust emissions have to be properly dilutedand thermally conditioned otherwise the particle size distributionand concentration could quickly undergo significant changes betweenthe source and measurement instrument (Hüglin et al.,1997; Burtscher, 2005). Therefore an ad-hoc design of the samplingsystem was made up in order to control the condensation andnucleation processes in the tract connecting the stack and theRotating Disk entrance as reported in Fig. 1. A sketch of the completesampling line employed in the measurement campaign isrepresented in Fig. 2 where aerosol temperature profile duringthe sampling line is also reported to emphasize the importance
of the thermal conditioning throughout sampling procedure. From
the Fig. 2 comes out that the aerosol, after a two-step thermodilution
process by flowing through the Rotating Disk Thermodiluter
and the Thermal Conditioner, can be sent to a CPC or an SMPS
depending on whether particle number concentration or size
distribution were measured.
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