scholarly journals The Efficiency of Pd Addition and Sr Substitution on La1−xSrxMnO3 to Remove Ventilation Air Methane in a Catalytic Flow Reversal Reactor

Atmosphere ◽  
2021 ◽  
Vol 13 (1) ◽  
pp. 54
Author(s):  
Yanxia Wang ◽  
Tao Zhu
Keyword(s):  
Greenhouse Gas Emissions ◽  
Greenhouse Gas ◽  
Coal Mining ◽  
Conversion Efficiency ◽  
Methane Conversion ◽  
Methane Concentration ◽  
Flow Reversal ◽  
Inlet Velocity ◽  
Different Types ◽  
Methane Concentrations

Ventilation air methane (VAM) is the main cause of greenhouse gas emissions in coal mining. Catalytic flow reverse reactor (CFRR) is widely used in VAM to mitigate methane emissions. In this study, palladium (Pd) and La1−xSrxMnO3 were used as catalysts in a CFRR. Different types of catalysts were prepared by loading La0.8Sr0.2MnO3, La0.9Sr0.1MnO3, and 0.1%Pd-La0.9Sr0.1MnO3 on a cordierite honeycomb reactor coated with γ-Al2O3 to compare their performances. In addition, this study compared the performance of the three catalysts in an 800 °C reactor based on different methane inlet concentrations, inlet speeds, and conversion times. The results showed: (1) 0.1% addition of Pd increased methane conversion. (2) La0.8Sr0.2MnO3 had higher efficiency at lower methane inlet concentrations, whereas La0.9Sr0.1MnO3 was more efficient at higher methane concentrations. This study demonstrates that a higher Sr loading is worth implementing only when the methane concentration of VAM is lower than 0.6%. (3) To achieve a higher methane conversion efficiency, the inlet velocity of methane should also be considered.

Ammonia and greenhouse gas emissions from different types of deep litter used for pig rearing

2016 ◽  
Vol 188 ◽  
pp. 166-173 ◽  
Author(s):  
Liping Zhang ◽  
Jing Sheng ◽  
Yuefang Zhang ◽  
Liugen Chen ◽  
Guofeng Sun ◽  
...  
Keyword(s):  
Greenhouse Gas Emissions ◽  
Greenhouse Gas ◽  
Gas Emissions ◽  
Different Types

scholarly journals Analysis of Methane Concentration Distribution at U-Ventilated Longwall Outlet – Case Study

2020 ◽  
Vol 3 (1) ◽  
pp. 149-168
Author(s):  
Adam Niewiadomski ◽  
Henryk Badura ◽  
Tanyana N. Ivanova ◽  
Alexandr Repko ◽  
Nikitin R. Yury
Keyword(s):  
Coal Mining ◽  
Concentration Distribution ◽  
Methane Concentration ◽  
Preventive Measures ◽  
Mining Industry ◽  
Work Safety ◽  
Coal Mining Industry ◽  
Threat Level ◽  
Methane Concentrations

AbstractThe methane hazard concerns a growing number of longwalls in the Polish coal mining industry each year. Mitigating this hazard, both of work safety and economic reasons requires the application of preventive measures adequate to its level. Commonly threat level is estimated based on registered methane concentrations, which fluctuate and highly depends on the place of measurement. The article presents studies on the average and maximum methane concentrations at the longwall outlet, including analyses of the interdependence of methane concentration in methanometry sensors installation locations.

Parametric Study of Thermal Flow-Reversal Reactor for Ventilation Air Methane Oxidation

2013 ◽  
Vol 372 ◽  
pp. 406-409
Author(s):  
Hao Xin Deng ◽  
Yu Xin Wen ◽  
Qi Xiao ◽  
Yun Han Xiao
Keyword(s):  
Methane Oxidation ◽  
Residence Time ◽  
Methane Conversion ◽  
Methane Concentration ◽  
Fixed Bed ◽  
Experimental Studies ◽  
Flow Reversal ◽  
Fixed Bed Reactor ◽  
Thermal Flow ◽  
Gas Velocity

Experimental studies of ventilation air methane oxidation were carried out in a thermal flow-reversal reactor and a fixed bed reactor in laboratory scale respectively. The reaction characteristics of ventilation air methane in a fixed bed reactor were investigated. The influence of the feed gas velocity and the lean methane concentration on the temperature profile in the thermal flow-reversal reactor was studied. The internal temperature uniformity of the cross section and the cavity of the flow-reversal reactor which have influence on lean methane conversion have also been discussed and analyzed. The results shows that the oxidation of lean methane needs to meet the ignition temperature condition and the residence time condition, and the temperature distribution in the thermal flow-reversal reactor is mainly related to the methane concentration and the feed gas velocity while the methane conversion rate is mainly related to the temperature and the residence time in the high temperature zone of the reactor.

Objections to a Carbon Tax

2019 ◽  
pp. 115-128
Author(s):  
Gilbert E. Metcalf
Keyword(s):  
Economic Growth ◽  
Greenhouse Gas Emissions ◽  
Greenhouse Gas ◽  
Climate Policy ◽  
Coal Mining ◽  
Emission Reduction ◽  
Carbon Tax ◽  
Coal Miners ◽  
Gas Emissions

This chapter addresses common objections to a carbon tax including whether the science is settled enough to put a price on greenhouse gas emissions, whether the tax will hurt economic growth, or whether the tax will kill jobs. It dispels a number of myths about climate policy and coal mining while making the case for providing transitional relief to coal miners and other groups particularly hard hit by the tax. It also discusses how the tax can be designed to ensure that long-term emission reduction goals are met.

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