Publication

Online Detection of Selenium and Its Retention in Reducing Gasification Atmosphere

Christian Ludwig, Andrea Testino, Mohamed Tarik, Adrian Hess
2016
Journal Articles

Abstract

The emission of selenium from coal gasification processes can cause harm to the environment and downstream equipment. With upcoming legislation, reliable detection as well as control of such gas species become crucial. This study therefore addresses the development and successful employment of an online analytical method, based on the direct introduction of a simplified flue gas (H-2, H2O, H2Se, Ar) into an ICP-MS. In combination with matrix matched calibration, the calculated and verified detection limits of H2Se lie below 1 ppbv, thus being comparable to current offline methods. These low detection limits and the high temporal resolution (>1 Hz) enable the use of this method as a quick and robust tool for the lab- and bench-scale performance evaluation of sorbent materials. As a case study, Zn/Al2O3 was tested toward H2Se capturing at warm temperatures (150-350 degrees C). The results show that both, the support and the active phase, interact with the contaminant. While gamma-Al2O3 can retain H2Se at dry reaction conditions, a Zn phase is needed for its capture in steam laden gas.

Official source

https://infoscience.epfl.ch/entities/publication/418a36ac-93c9-455b-b8c0-4ceb1b1be487

About this result

This page is automatically generated and may contain information that is not correct, complete, up-to-date, or relevant to your search query. The same applies to every other page on this website. Please make sure to verify the information with EPFL's official sources.

Christian Ludwig, Andrea Testino, Mohamed Tarik, Adrian Hess
2016
Journal Articles

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/418a36ac-93c9-455b-b8c0-4ceb1b1be487

About this result

Related concepts (21)

Gasification

Gasification is a process that converts biomass- or fossil fuel-based carbonaceous materials into gases, including as the largest fractions: nitrogen (N2), carbon monoxide (CO), hydrogen (H2), and carbon dioxide (). This is achieved by reacting the feedstock material at high temperatures (typically >700 °C), without combustion, via controlling the amount of oxygen and/or steam present in the reaction. The resulting gas mixture is called syngas (from synthesis gas) or producer gas and is itself a fuel due to the flammability of the H2 and CO of which the gas is largely composed.

Coal pollution mitigation

Coal pollution mitigation, sometimes called clean coal, is a series of systems and technologies that seek to mitigate the health and environmental impact of coal; in particular air pollution from coal-fired power stations, and from coal burnt by heavy industry. The primary focus is on sulfur dioxide () and nitrogen oxides (), the most important gases which caused acid rain; and particulates which cause visible air pollution, illness and premature deaths. can be removed by flue-gas desulfurization and by selective catalytic reduction (SCR).

Coal gasification

In industrial chemistry, coal gasification is the process of producing syngas—a mixture consisting primarily of carbon monoxide (CO), hydrogen (), carbon dioxide (), methane (), and water vapour ()—from coal and water, air and/or oxygen. Historically, coal was gasified to produce coal gas, also known as "town gas". Coal gas is combustible and was used for heating and municipal lighting, before the advent of large-scale extraction of natural gas from oil wells.

Related publications (25)

Biodiesel from Bark and Black Liquor-A Techno-Economic, Social, and Environmental Assessment

Julia Granacher

A techno-economic assessment and environmental and social sustainability assessments of novel Fischer-Tropsch (FT) biodiesel production from the wet and dry gasification of biomass-based residue streams (bark and black liquor from pulp production) for tran ...

MDPI2024

Biomass screening for syngas production by flash photopyrolysis

Hubert Girault, Mathieu Soutrenon, Wanderson Oliveira Da Silva

A few seconds flash photopyrolysis is used as efficient screening tool for the investigation of selected biomass in producing syngas, hydrogen and biochar. This innovative approach allowed rapid pyrolysis of the biomass, which was followed by a precise gas ...

Royal Soc Chemistry2024

SIMPLE HIERARCHICAL PLANNING WITH DIFFUSION

Chang Chen, Caglar Gulcehre

Diffusion-based generative methods have proven effective in modeling trajectories with offline datasets. However, they often face computational challenges and can falter in generalization, especially in capturing temporal abstractions for long- horizon tas ...

2024