Effect of the Presence of HCl on Simultaneous CO2 Capture and Contaminants Removal from Simulated Biomass Gasification Producer Gas by CaO-Fe2O3 Sorbent in Calcium Looping Cycles

Alex C K Yip,Shusheng Pang,Vlatko Materic,Mohammad Nusheh,Forogh Dashtestani,Janjira Hongrapipat,Vilailuck Siriwongrungson

doi:10.3390/en14238167

Alex C K Yip, Shusheng Pang + Show 5 more

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https://doi.org/10.3390/en14238167

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Abstract

This study investigated the effect of HCl in biomass gasification producer gas on the CO2 capture efficiency and contaminants removal efficiency by CaO-Fe2O3 based sorbent material in the calcium looping process. Experiments were conducted in a fixed bed reactor to capture CO2 from the producer gas with the combined contaminants of HCl at 200 ppmv, H2S at 230 ppmv, and NH3 at 2300 ppmv. The results show that with presence of HCl in the feeding gas, sorbent reactivity for CO2 capture and contaminants removal was enhanced. The maximum CO2 capture was achieved at carbonation temperatures of 680 °C, with efficiencies of 93%, 92%, and 87%, respectively, for three carbonation-calcination cycles. At this carbonation temperature, the average contaminant removal efficiencies were 92.7% for HCl, 99% for NH3, and 94.7% for H2S. The outlet contaminant concentrations during the calcination process were also examined which is useful for CO2 reuse. The pore structure change of the used sorbent material suggests that the HCl in the feeding gas contributes to high CO2 capture efficiency and contaminants removal simultaneously.

Highlights

A growing need to reduce carbon dioxide (CO2 ) emissions has led to development of new materials and processes for effective, economical, and reliable carbon capture.The low costs and readily availability of Ca-based material makes the calcium-looping (CaL) process very promising for CO2 capture from combustion flue gas and gasification producer gas [1,2,3,4]
Our previous studies have investigated the CO2 capture efficiency of the CaO-Fe2 O3 sorbent in the producer gas without contaminants [28]
The effect of hydrogen chloride (HCl) contaminant was examined in combination with NH3 and hydrogen sulphide (H2 S), at carbonation temperatures of 620–680 ◦ C to compare with the cyclic CO2 capture efficiencies

Summary

Introduction

The low costs and readily availability of Ca-based material makes the calcium-looping (CaL) process very promising for CO2 capture from combustion flue gas and gasification producer gas [1,2,3,4]. The calcium looping technology has been studied to improve the producer gas quality and increase the producer gas energy content when the CO2 sorbent material is applied to the biomass gasification process [5,6,7]. The calcium looping process consists of two reversible reactions among CaO, CO2 , and. The producer gas from steam biomass gasification mainly consists of H2 , CO, CO2 , and CH4 [2,3]

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