The fouling behavior of rice husk ash in fluidized-bed combustion. 2. Pilot-scale and full-scale measurements

A1 Originalartikel i en vetenskaplig tidskrift (referentgranskad)


Interna författare/redaktörer


Publikationens författare: Skrifvars BJ, Yrjas P, Lauren T, Kinni J, Tran H, Hupa M
Förläggare: AMER CHEMICAL SOC
Publiceringsår: 2005
Tidskrift: Energy and Fuels
Tidskriftsakronym: ENERG FUEL
Volym: 19
Nummer: 4
Artikelns första sida, sidnummer: 1512
Artikelns sista sida, sidnummer: 1519
Antal sidor: 8
ISSN: 0887-0624


Abstrakt

This paper is the second in a series of two on the slagging and fouling behavior of rice husk when fired alone or in combination with other fuels in a fluidized-bed boiler. The first paper involved the fuel properties of rice husk, as investigated by a variety of laboratory methods. In this second paper, we report the results of fireside fouling measurements when burning rice husk alone and together with eucalyptus bark in various ratios. This study is based on shortterm (3 - 10 h) deposit samples taken with air-cooled deposit probes in the superheater region of a large-scale (157 MWth) bubbling fluidized-bed (BFB) boiler burning rice husk and eucalyptus bark. Using an entrained-flow type of pilot furnace, we further made more, systematic measurements of the influence of the fuel mixture ratio on the fouling tendency of the fly ash formed. Burning of rice husk alone did not result in any detectable fouling, neither in the pilot furnace nor on the deposit probes in the superheater area of the fluidized-bed boiler. After deposit samplings with durations of up to 10 h during 100% rice husk firing, the deposit sampling probe had not collected more than similar to 95 mg of deposit material. The combustion of eucalyptus bark alone caused significant fouling. Here, the corresponding amount of deposit was similar to 90 mg after 10 h of sampling. The fouling tendency of mixtures of rice husk and bark showed a nonlinear dependence on the fuel mixture ratio. The results suggest that the rice husk ash acted as an erosive, cleaning agent in the fly ash mix.

Senast uppdaterad 2019-19-11 vid 04:40