Simulation of Soot Formation in Pulverized Coal Combustion under O/N and O/CO Atmospheres.

In this study, simulations were carried out to study the combustion characteristics within a 600 MW W-shaped pulverized coal boiler under O/N and O/CO atmospheres. The objective of this work is to develop and validate a novel model for pulverized coal combustion under O-enriched conditions, specifically optimized for the O/CO atmosphere. The innovation in this model lies in the precise calibration of kinetic constants for soot nucleation and surface growth rates, enabling a more accurate simulation of flame characteristics (such as the flame temperature and soot volume fraction) under O-enriched combustion conditions.

Simulation of Pulverized Coal Combustion Process Considering Turbulence-Radiation Interaction.

In this paper, the combustion process of a 350 MW opposite pulverized coal combustion boiler is studied using a combined field test and numerical simulation. Considering the turbulence-radiation interaction (TRI) effect caused by turbulent particle pulsation during the combustion process, the TRI model is modified by introducing optical factors. The interaction between the optical thickness and the radiation pulsation of pulverized coal particles during the combustion process is studied to learn the influences of turbulent particle combustion on radiative heat transfer.

Study of the Fluidized Separation Process of Irregular Coarse-Grained Pulverized Coal Agglomerates Based on Modified Computational Fluid Dynamics-Population Balance Method.

In this work, the agglomeration, fragmentation, and separation process of coarse-grained pulverized coal agglomerates (CGPCA) obtained from a power plant were achieved using gas-solid fluidized bed sorting and analyzed through a combination of numerical simulations and actual experiments with CGPCA. To study the polydispersity and irregularity of CGPCA, the CGPCA surface fractal dimension was calculated using fractal dimension combined with scanning electron microscopy. The two-section fractal dimension of the particle size distribution was obtained by fitting the logarithmic particle size distribution of CGPCA.

The Selective Transport of Ions in Charged Nanopore with Combined Multi-Physics Fields.

The selective transport of ions in nanopores attracts broad interest due to their potential applications in chemical separation, ion filtration, seawater desalination, and energy conversion. The ion selectivity based on the ion dehydration and steric hindrance is still limited by the very similar diameter between different hydrated ions. The selectivity can only separate specific ion species, lacking a general separation effect.

Impact of China's waste import policy on the scrap copper recovery pattern and environmental benefits.

The international trade weight of scrap copper has exceeded 6 million tons annually over the past two decades. China introduced the "National Sword" policy in 2017, which brought uncertainty to the international recycling of scrap copper. We use the international scrap copper trade figures from 1998 to 2019 in UN Comtrade, and seek to analyze the impact of China's import ban by setting up a difference-in-differences (DID) model based on the gravity model.

Simulation of Turbulent Combustion in a Large Pulverized Coal Boiler Based on Turbulent Radiation Interaction and the Modified Soot Model.

A combustion heat transfer model suitable for engineering combustion simulation was developed. Using the model, pulverized coal combustion and the soot generation process were simulated in a 300 MW tangentially fired pulverized coal furnace. Here, we proposed a soot evolution model which includes the nucleation, growth, agglomeration, and oxidation processes in the pulverized coal combustion process based on the population balance method.