Feedback and Feedforward Control of a Biotrickling Filter for H2S Desulfurization with Nitrite as Electron Acceptor

Applied Sciences

Domingo Cantero¹  Javier Brito¹  Martín Ramírez¹  Fernando Almenglo¹ 

[1] Department of Chemical Engineering and Food Technologies, Faculty of Sciences, University of Cadiz, Instituto Universitario de Investigación Vitivinícola y Agroalimentario (IVAGRO), 11510 Puerto Real, Cádiz, Spain;

关键词: Anoxic;    biogas desulphurization;    feedback control;    feedforward control;    nitrite;   

DOI  :  10.3390/app9132669

来源: DOAJ

【 摘 要 】

Biotrickling filters’ control for H₂S removal has special challenges because of complexity of the systems. Feedback and feedforward control were implemented in an anoxic biotrickling filter, operated in co-current flow mode and using nitrite as an electron acceptor. The feedback controller was tuned by three methods—two based on Ziegler-Nichols’ rules (step-response and maintained oscillation) and the third using the Approximate M-constrained Integral Gain Optimization (AMIGO). Inlet H₂S staircase step perturbations were studied using a feedforward control and the effect of EBRT considered by feedback control. The tuning method by maintained oscillation shows the lower errors. The selected controller was a PI, because unstable behavior at the lowest H₂S inlet loading was found under a PID controller. The PI control was able to maintain an outlet H₂S concentration of 14.7 ± 0.45 ppm_V at three EBRT, studied at 117 s, 92 s and 67 s. Therefore, desulfurized biogas could be used to feed a fuel cell. Feedforward control enhances BTF performance compared to the system without control. The maximum outlet H₂S concentration was reduced by 26.18%, although sulfur selectivity did not exceed 55%, as elemental sulfur was the main oxidation product.

【 授权许可】

Unknown