Mercury released into the atmosphere from coal combustion is harmful to humans and the environment. Rice husk gasification char (RHGC) is an industrial waste of biomass gasification power generation, which is silver-loaded to develop a novel and efficient sorbent for mercury removal from simulated flue gas. The experiment was carried out in a fixed-bed experimental system. The Hg ⁰ adsorption performance of RHGC was improved significantly after loading silver. Hg ⁰ adsorption capacity and mercury inlet concentration were found to be nonlinear. The adsorption capacity of RHGC decreased with the increase of reaction temperature. SO ₂ inhibited mercury removal, NO and HCl promoted mercury removal; the Hg ⁰ adsorption capacity in the simulated flue gas was higher than that in pure N ₂ . The silver-loaded rice husk gasification char (SRHGC) could be recycled about five times without significantly losing its removal efficiency. The SRHGC will not only reduce the cost of mercury removal but also save energy and reduce environmental pollution. At the same time, it provides a new way for the resource utilization of RHGC.

Computational fluid dynamics (CFD) simulations are performed to reveal the significant effects of radiation on predictive accuracy of thermal environment in a transient buoyancy-driven natural ventilation classroom. The present numerical method is verified by the experimental results. The time evolutions of airflow field, radiation heat flux, buoyancy force, and airflow rate are analyzed in details. In addition, the effects of radiation on thermal comfort are evaluated by three different indices. It is found the radiation plays a critical role in the establishment of indoor thermal environment. The proportion of radiation heat flux increases with the effective radiation area but decreases with the power of the occupants.`Finally, the indoor space can be divided into five different occupied zones depending on how much radiation heat the occupants emit. The radiation can change the indoor heat flux distribution, directly leading to a smaller buoyancy force and ventilation rate. As a result, the thermal comfort except for draft is linearly affected by both the power and the effective radiation area, and the greater the proportion of radiation heat flux is, the better indoor thermal comfort is. These conclusions demonstrate the radiation has a noticeable impact on the dynamic evaluations of indoor thermal environment.

In this work, a new method using an external magnetic field enhanced the capture of Fe-based fine particles by magnetic fibers was proposed. The process of Fe-based fine particle capture by magnetic fibers in two structure arrangements (staggered/parallel) was numerically simulated based on a computational fluid dynamics-discrete phase model (CFD-DPM) method. Different magnetic fields could be formed by adding uniform magnetic fields along with the X-, Y-, and Z-axes were added to the domain where the magnetic fibers were located. The movement trajectories and filtration efficiencies in two structure arrangements under different magnetic fields were compared. The results showed that when v = 0.1 m/s, and 0.5 µm ≤ d_p ≤ 2.5 µm, the results were relatively stable when the external magnetic field was along the X-, and Y-axes, and the filtration efficiency of the staggered structure was higher than that of the parallel structure. The results fluctuated greatly when the external magnetic field was along the Z-axis. Within the same fibrous structure arrangement, when the direction of the uniform magnetic field was the same as the direction of the face velocity ( $\overrightarrow{H}$// $\overrightarrow{v}$⊥ ${\overrightarrow{l}}_{\mathit{fiber}}$), the performance of Fe-based fine particle capture by the magnetic fibers was the best.