The Effect of Structure Modification of Sodium Compounds on the SO2 and HCl Removal Efficiency from Fumes in the Conditions of Circulating Fluidised Bed

Abstract

The article presents the effects of mechanical and thermal modification on the surface area of sodium bicarbonate and its ability to remove SO 2 and HCl from exhaust fumes.The mechanical modification consisted of grinding in an impact mill. The thermal modification consisted of heating in the temperature range from 373 K to 673 K. The applied modifications caused a change in the grain structure of sodium bicarbonate and parameters such as specific surface area and the pore size. The parameters were determined by low-pressure nitrogen adsorption (LPNA) and mercury porosimetry (MIP) methods. The largest development of the active surface, which was up to 6 m 2 g -1 (LPNA), was achieved after crushing and heating in the temperature range of 423-523 K.The efficiency of a simultaneous purification of fumes from SO 2 i HCl on a continuous-combustion installation with a circular fluidised bed CFB was determined. The samples were fed into the installation in three different molar ratios 2Na/S (0.5; 1.0; 2.1) in a gas jet of 573 K. It was shown that the removal of SO 2 and HCl took place simultaneously and mainly on the grain surface. The average efficiency of SO 2 purification was between 17 % and 89 %, and it depended on the comminution degree and the amount of the sorbent. The efficiency of HCl removal was between 54 and 78 %.

A Comparative Life Cycle Assessment of Marine Desox Systems

“…The system is more complex than the seawater one. The principle of this mode is described as follows [20]:…”

Effect of Metal and Carbon Nanotube Additives on the Thermal Diffusivity of a Silica Gel-Based Adsorption Bed

“…Mixtures with various compounds, including nanomaterials, graphite, crystals, or chemical modifications involving the introduction of functional groups [51], may increase the gas and vapor adsorption capacity of silica gels. This relationship also applies to thermal and mechanical changes in other mesoporous and macroporous materials [52,53]. It is possible to improve the thermal properties by using a composition of silica gel and materials with a high thermal conductivity [14,54,55].…”

Accumulation and Emission of Water Vapor by Silica Gel Enriched with Carbon Nanotubes CNT-Potential Applications in Adsorption Cooling and Desalination Technology

“…Mixtures with various compounds, including nanomaterials, graphite, crystals, or chemical modifications involving the introduction of functional groups [15], can increase silica gels' adsorption capacity to gases. This dependence also applies to thermal and mechanical changes in other mesoporous and macroporous materials [16,17]. The literature describes the possibility of improving the thermal properties by using an SG composition and materials with high thermal conductivity.…”