Device and method for manufacturing semi-carbonized fuel of biomass, and power generation system using semi-carbonized fuel

摘要

Provided are a device and a method for manufacturing a semi-carbonized fuel of a biomass that does not require an external heat source and is capable of suppressing adhesion of tar, condensed water, or the like to a pipe. The device includes a drying device for heating and drying a biomass, a pyrolysis device for decomposing the dried biomass, and a combustion device for supplying heat to the drying device and the pyrolysis device. The pyrolysis device is supplied with a part of a combustion exhaust gas generated in the combustion device, directly mixes the supplied combustion exhaust gas and the biomass to heat and pyrolytically decompose the biomass, and supplies a mixed gas of a generated pyrolysis gas and the combustion exhaust gas to the combustion device. The combustion device is supplied with an air for combustion, combust the supplied mixed gas, and generate the combustion exhaust gas.

主权项

1. A method for manufacturing a semi-carbonized fuel of a biomass, the method comprising:
a drying step to heat and dry the biomass; a pyrolysis step to pyrolytically decompose the biomass dried by the drying step; and a combustion step to generate heat used in the drying step and the pyrolysis step, wherein
in the pyrolysis step, a part of a combustion exhaust gas generated in the combustion step is directly mixed with the biomass to heat and pyrolytically decompose the biomass, and a generated pyrolysis gas and the combustion exhaust gas used for heating are mixed to generate a mixed gas;in the combustion step, an air for combustion and the mixed gas are combusted, a part of the generated combustion exhaust gas is used in the pyrolysis step, and a remainder of the generated combustion exhaust gas is used in the drying step,an oxygen concentration of the combustion exhaust gas used in the pyrolysis step is set to be lower than an oxygen concentration of the combustion exhaust gas used in the drying step, andin the diving step a part of the combustion exhaust gas generated in the combustion device is supplied in the drying step there is a direct mixing of a part of the supplied combustion exhaust gas and the biomass, in the drying step a remainder of the supplied combustion exhaust gas exchanges heat with the biomass by indirect heat transfer, and in the drying step a generated gas is supplied to the combustion step.