| 摘要 |
PROBLEM TO BE SOLVED: To actually and simply lower the cost with the principle simpler than that of PID control, and to stably keep the methane concentration of concentrated methane gas. SOLUTION: A control part controls the biogas loading quantity based on a control quantity at control intervals from alteration of the biogas loading quantity to stabilization of the methane concentration thereafter (S3), after the control quantity is calculated from the alteration amount of the biogas loading quantity and the alteration amount of the methane concentration (S1). The control part corrects the control intervals based on the control intervals in the initial period, the biogas loading quantity in the initial period, and the biogas loading quantity after the initial period. The control part corrects the control intervals T based on the calculation of T=T<SB>0</SB>×(Q<SB>0</SB>/Q), wherein T<SB>0</SB>represents a control intervals set in the initial period; Q<SB>0</SB>represents a biogas loading quantity set in the initial period; and Q represents a biogas loading quantity set after the initial period. COPYRIGHT: (C)2009,JPO&INPIT
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