| Summary: | Made available in DSpace on 2016-04-28T14:56:37Z (GMT). No. of bitstreams: 1
2009 - Flavio Silva Machado.pdf: 1243667 bytes, checksum: a4dcd3f6ca4e213e694088f27e855547 (MD5)
Previous issue date: 2009-11-27 === The main aim of this paper is to check the environmental and economical gains of mixtures of
fines of vegetal and mineral coal (both Brazilian and imported ones) in the injection in blast
furnaces for iron, aiming its use as fuel, the lowering of carbon emission rates, the trading of
Reduced Emission Certificates and also restart the production of Brazilian mineral coal for the
steel making industry. It was used vegetal coal from Eucalyptus urophylla woods (CVSG).
The mineral coal was from Australia and Indonesia (S.Walker Creek Weak and Kaltim Prima
coals) and the Brazilian mineral coals from the several coal mines located in the south of
Brazil, such as: coal CRM-CE4200 (CN1), coal CRM-CE6700 (CN2), coal COPELMICE5200
(CN3), coal COPELMI-CE6000 (CN4), coal COPELMI-CE6500 (CN5), Carbon?fera
Metropolitana-Antracito-CM20 (CN6) and Rio Deserto mineral coal (CN7). The results of
elementary and immediate chemical analyses were evaluated as well as the analyses of coal
ash components, the binary basicity of scraps, the size of grains, the grindability and the
density and porosity of the coals. Vegetal coal fines were mixed to mineral coal fines from
abroad and from Brazil in different proportions and the main characteristics of each mix were
evaluated; such characteristics are important when the injection in blast furnaces is made.
(operational limits). It was also evaluated the efficiency in burning of each coal mix. Having
the combustion efficiency rates as base, the 80% mix CVSG 20% CN1 presented the best
conditions to be injected in the blast furnace tuyeres. This mix also presented favorable
environmental conditions because it allowed the lowering of carbon emission rates, as much
as 41,26 kilos per ton of produced pig iron. Such rates improved the trading of Reduced
Emission Certificates to US$ 0.86/ton of produced iron. Moreover, there was a reduction in
the injection of coal fines of US$ 1.20/ton of iron. Adding up environmental and economical
gains, using the 80 % CVSG 20 % CN1 mix, the amount of US$ 2.06/ton of iron is reached. === O objetivo geral deste trabalho foi avaliar os ganhos ambientais e econ?micos, de misturas de
finos carv?o vegetal com carv?o mineral (importado e nacional), atrav?s da inje??o em alto
forno, visando o aproveitamento de matriz energ?tica, a redu??o dos ?ndices de emiss?es de
carbono, a comercializa??o de Certificados de Emiss?es Reduzidas e tamb?m a retomada da
produ??o de carv?o mineral nacional para o setor sider?rgico. Foram utilizados carv?o vegetal
proveniente da madeira de Eucalytus urophylla (CVSG), carv?es minerais importados da
Austr?lia e Indon?sia (carv?o S. Walker Creek Weak e carv?o Kaltim Prima) e carv?es
minerais nacionais provenientes de diferentes minas localizadas na Regi?o Sul do Brasil, a
saber: carv?o CRM-CE4200 (CN1), carv?o CRM-CE6700 (CN2), carv?o COPELMI-CE5200
(CN3), carv?o COPELMI-CE6000 (CN4), carv?o COPELMI-CE6500 (CN5), Carbon?fera
Metropolitana-Antracito-CM20 (CN6) e Carv?o mineral Rio Deserto CN7). Foram avaliados
os resultados das an?lises qu?micas imediata e elementar, bem como da composi??o das
cinzas dos carv?es; da basicidade bin?ria das esc?rias; da granulometria, da moabilidade, da
densidade e da porosidade dos carv?es. Finos de carv?es vegetais foram misturados com finos
de carv?o mineral importado e nacional em diferentes propor??es, sendo avaliadas as
principais caracter?sticas das misturas que s?o importantes quando se procede a inje??o no
alto forno sider?rgico (limites operacionais). Para cada mistura foi avaliada tamb?m as
efici?ncias de queima dos carv?es. Tendo-se por base os ?ndices de efici?ncia de combust?o
das misturas de carv?es, a mistura 80 % CVSG 20 % CN1 apresentou melhores condi??es
para ser injetada nas ventaneiras do alto forno. Apresentou tamb?m condi??es ambientais
favor?veis, pois permitiu redu??o dos ?ndices de emiss?es de carbono na ordem de 41,26 kg
por tonelada de ferro gusa produzido e favorecendo a comercializa??o dos Certificados de
Emiss?es Reduzidas em US$ 0,86 por tonelada de ferro produzido. Houve tamb?m uma
redu??o do custo de inje??o de finos de carv?o de US$ 1,20 por tonelada de ferro produzido.
Somando os ganhos ambientais e comerciais com a mistura 80 % CVSG 20 % CN1 ser?o
US$ 2,06 por tonelada de ferro produzido.
|
|---|
