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Elemental mercury emission from power station is hard to dissolve in water so that it is difficult to remove. Applying activated carbon or other sorbents to capture mercury in the flue gas has brought up wide attention. In order to develop coal-fired flue gas mercury sorbent which is effective with low consumption, CO2 activation and ZnCl2 impregnated and other methods have been conducted to modify...
The interactions of mercury with the carbon surface are investigated by performing the density functional electrical structure calculation. The five different carbon groups bonded with the elemental hydrogen and chlorine are proposed to build the carbon surfaces. The calculations are presented for mercury sorption on both on-top (T) and sixfold-angle (A) sites. The adsorption energy curve reveals...
Due to its harm to human health, mercury emission from coal combustion power stations has brought more and more concern. The existed APCDs such as bag filter, electrostatic precipitator and wet FGD may remove the oxidized mercury from the flue gas. However, they have no obvious removal efficiency on the elemental mercury. The main direction in the development of new mercury removal technology is to...
More and more concern has been put on the mercury emitted from power stations burning coal because of its harm to human health. Both of the US EPA and European Commission have set regulations on the mercury emission from the electric utilities. China also pays more and more attention to the mercury emission and starts to sponsor the projects relative to the mercury emission and its control. Mercury...
In this paper, a novel computational scheme, local whole-information difference scheme (LWDS), was proposed to solve significant pseudo diffusion in recirculating flow zone during numerical simulation. In LWDS, the effect of all of the local around points on the control volume was considered to demonstrate the spatial characteristics of the flow, and the weighted value at each point is adjusted according...
A typical coal used widely in the power stations in Shanghai area is adopted as the experimental coal type. A pilot-scale coal-combustion furnace was designed and constructed to study the mercury speciation and transformations in the flue gas under different conditions. The results showed that gaseous mercury in the tested coal products accounted for two thirds of total mercury and solid-state mercury...
A simultaneous test between a dry and wet based SCEM system was conducted at ESP outlet of a power station. The data by the dry and wet based methods showed a similar changing trend, and the difference between the two is within an acceptable range. According to the analysis of the relative standard difference (RSD), it was found that the dry based method could provide higher quality data than the...
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