Performance evaluation of different combined systems of biochar gasifier, reformer and CO 2 capture unit for synthesis gas production

Syngas Production from Combined Steam Gasification of Biochar and a Sorption-Enhanced Water–Gas Shift Reaction with the Utilization of CO2

“…This could be due to the result of water-gas shift reaction (Equation (7)), where the main gasification product, CO, is further reacted with steam to form H 2 and CO 2 in the steam reforming reactor. Water-gas shift reaction CO (g) + H 2 O (g) CO 2 (g) + H 2 (g) ∆H = −41 kJ/kmol (7) Combining gasification with reforming system in different patterns shows the effect on syngas production and CO 2 emission ratio as demonstrated in Figure 6. The CBGR-PreCO 2 offers higher H 2 than the CBGR-PostCO 2 , which is in good agreement with our simulation results proposed previously [7].…”

“…Water-gas shift reaction CO (g) + H 2 O (g) CO 2 (g) + H 2 (g) ∆H = −41 kJ/kmol (7) Combining gasification with reforming system in different patterns shows the effect on syngas production and CO 2 emission ratio as demonstrated in Figure 6. The CBGR-PreCO 2 offers higher H 2 than the CBGR-PostCO 2 , which is in good agreement with our simulation results proposed previously [7]. The enhancement of H 2 is believed to be mainly due to the result of the water-gas shift reaction.…”

“…As shown in the previous section, biochar gasification can yield insignificant amount of H 2 , to enhance the production of H 2 , reforming reactor was introduced into the gasification system. In this investigation, to prove the concept of our simulation works [7] and to introduce process integration concept, three different packing patterns of sorbent and catalyst were studied, as shown in Figure 4. In Figure 4a, the catalyst and the sorbent were packed separately and the catalyst was packed on top of the sorbent, designated as the combined biomass gasifier and water-gas shift with Post-CO 2 recycle (CBGR-PostCO 2 ).…”

“…The conversion of biomass by thermochemical processes such as gasification or pyrolysis has been extensively used to produce syngas and is recognized as an environmental-friendly technique as it is carbon-neutral [4]. The thermochemical process can be performed using different operating conditions, i.e., gasifying agent, temperature, pressure, etc., which could yield different amounts and compositions of syngas [5][6][7]. In addition, strategic techniques have also been applied for upgrading syngas, i.e., integrated gas-solid simultaneous gasification and catalytic reforming [8], a two-stage pyrolysis-reforming system [9], a two-stage gasification-reforming system [10], catalytic pyrolysis of biomass in a two-stage fixed bed reactor system [11], etc.…”

“…As is known, the release of CO 2 is a cause of the greenhouse gas effect; storage or utilization of CO 2 has therefore attracted interest worldwide. In our previous work [7], utilization of the released CO 2 as a co-gasifying agent has been investigated for combined gasification with the steam reforming process via thermodynamic analysis using the Aspen Plus program. The results showed that the use of CO 2 recycled from a separation process as a co-gasifying agent could enhance coal gas efficiency and reduce CO 2 emissions.…”