Coal triggering pollution caused by the emission of harmful substances in process coal combustion has been paid more and attention. Barium is a ubiquitous heavy metal element coal. During combustion, Ba released into environment different forms, coal-fired products with high content can cause harm to environment, human health even pose serious threat life. By reviewing literature, distribution,...

Mercury (Hg) is a toxic air pollutant with coal-fired utility plants being the largest anthropogenic Hg emission source in the United States. The extent that Hg can be removed from power plants using conventional air pollution control devices (APCDs) is significantly affected by Hg speciation in flue gas. Oxidized Hg (Hg) is preferable to elemental Hg (Hg) in that Hg is less volatile and solubl...

Direct household use of unprocessed raw coals for cooking and heating without any air pollution control device has caused serious indoor and outdoor environment problems by emitting particulate matter (PM) and gaseous pollutants. This study examined household emission reduction by switching from unprocessed bituminous and anthracite coals to processed semi-coke briquettes. Two typical stoves we...

During pulverized coal combustion, a fume of submicron particles is formed from the mineral matter in the parent coal. Studies of the variation in chemical composition with particle size have revealed that much of the submicron fume is formed from volatilized coal ash [l, 2,3]. The formation and evolution of the ash fume is governed by homogeneous nucleation, condensation, and coagulation. Vapo...

Differential scanning calorimetry (DSC), temperature programmed desorption mass spectrometry (TPD-MS) and small angle neutron scattering (SANS) were used to investigate CO2 uptake by the Wyodak coal. Adsorption of carbon dioxide on Wyodak coal was studied by DSC. The exotherms evident at low temperatures are associated with the uptake of CO2 suggesting that carbon diox...

High and volatile fossil fuel prices, growing concerns over energy security and the risk of climate change have all contributed to revived interest in nuclear power around the world. This is particularly the case in fast developing ASEAN countries. However, there is still considerable uncertainty about the prospects of nuclear power in terms of its economic viability and associated risks given ...

An investigation focused on the transformation and distribution behaviors of trace elements and natural radionuclides around a coal gangue brick plant was conducted. Simultaneous sampling of coal gangue, brick, fly ash and flue gas were implemented. Soil, soybean and earthworm samples around the brick plant were also collected for comprehensive ecological assessment. During the firing process, ...

Abstract Cocurrent and countercurrent units are common configuration of biomass and coal gasifiers. Moving solid beds contact a flowing gas phase, usually air, steam or their mixtures. Batch and fluidized bed reactors, or drop tube gasifiers are also alternative units. The complexity of these systems relies in several aspects: the chemistry of the released species in the first devolatilization ...