PROBLEM TO BE SOLVED: To burn a combustible off-gas as a fuel without needing a storage device such as a large-scaled gas holder.;SOLUTION: In this off-gas combustion boiler system in which a combustible gas generating device 11 generating the combustible off-gas and an off-gas boiler 1 for burning the off-gas are connected by an off-gas supply passage 3, and the off-gas generated by the combustible gas generating device 11 is burned by the off-gas boiler 1, the off-gas supply passage 3 is provided with a primary pressure regulation valve 4 for regulating a pressure of the supplied off-gas, and a secondary pressure regulation valve 5 disposed at a downstream side with respect to the primary pressure regulation valve 4 for regulating the pressure to a pressure lower than that by the primary pressure regulation valve, an off-gas pressure detecting device 9 is disposed to detect the pressure of the off-gas between the primary pressure regulation valve 4 and the secondary pressure regulation valve 5, and the combustion of the off-gas boiler 1 is controlled on the basis of the off-gas pressure detected by the off-gas pressure detecting device 9.;COPYRIGHT: (C)2010,JPO&INPIT
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