A study on the spontaneous combustion concern over the storage of Enviro-coal
|關鍵字:||環保煤;自燃;低溫氧化;enviro-coal;spontaneous combustion;low-temperature oxidation|
While enjoying the advantages of having high reserves, low electricity production cost, high investment return, and much less nuclear-reactor-type of disputes, the use of coal fire nevertheless is tarnished by the fact that its burning release would cause serious contamination of the environment. The latter normally is required to be sized down via great size-up of all related post-processing facilities in order to comply with the environmental regulations. A new type of coal, enviro-coal (or, low-ash, low-sulfide-aerosol coal) has emerged and proved that, by using it instead, the as-released chimney outputs from normal boilers can already meet the environmental guidelines without having to incorporate further post-processing units. Therefore, in the global trend of increased public demand for a cleaner earth and subsequent much tighter environmental laws, adoption of the enviro-coal is seen to be a much better, likely inevitable alternative. However, the highly volatile, small-size particulate characteristics of the enviro-coal still is susceptible to oxidation and thus latent heat generation, which constitute great concern over the somewhat high risk of spontaneous ignition (or combustion) during its storage and transport. This thesis aims to study the internal temperature distribution and the tendency of spontaneous heat generation of a pile of enviro-coal (adaro, produced in Indonesia) situated in the open field of Tai-Power Taichung Thermal Power Plant. It is found that, via on-site measurements and coal content analyses, the surface water content of the enviro-coal and its surrounding wind speed are the two main factors deciding the rate of the internal heat generation and thus the subsequent temperature rising. It is hoped that the information disclosed by this current study may serve as an important safety reference to the coal field administration staff in general and in the end promote the wide-ranged use of the promising new alternative: enviro-coal.
|Appears in Collections:||Thesis|