Biomass solid fuel manufacturing method and biomass solid fuel manufacturing device
A biomass solid fuel manufacturing method, including: a heating step of carbonizing a biomass molded body formed by molding raw material biomass, in an external heating type rotary kiln, in which the rotary kiln includes a non-heating zone that is provided on an upstream side of a kiln body and is not provided with a heating unit on an outer circumference, the non-heating zone includes a spiral blade on an inner circumferential surface, and in the heating step, the biomass molded body is introduced to the non-heating zone of the kiln body.
1. A biomass solid fuel manufacturing method, comprising: introducing a biomass molded body formed by molding raw material biomass into a non-heating zone of an rotary kiln; transferring the biomass molded body into a heating zone of the rotary kiln; carbonizing the biomass molded body, in the heating zone of the rotary kiln, wherein: the non-heating zone extends axially along an upstream side of a cylindrical kiln body and is not provided with a heater on an outer circumference, the heating zone extends axially along a downstream side of the non-heating zone and is provided with a heater on an outer circumference thereof such that the inner circumference thereof is heated, the non-heating zone includes a spiral blade on an inner circumferential surface configured to transfer the biomass molded body from the non-heating zone to the heating zone, the heating zone includes a lifter blade extending axially along an entire length of an inner circumferential surface thereof, the lifter blade protrudes toward a rotational axis of the rotary kiln from the inner circumferential surface of the heating zone.
2. The biomass solid fuel manufacturing method according to claim 1 ,
wherein in the rotary kiln, a carbonizing temperature in a heating zone in which the heating unit is provided on the outer circumference of the kiln body is lower than 300.degree. C.
3. A biomass solid fuel manufacturing device, comprising:
an external heating type rotary kiln carbonizing a biomass molded body formed by molding raw material biomass,
wherein:
the rotary kiln includes a non-heating zone extends axially along an upstream side of a cylindrical kiln body and is not provided with a heater on an outer circumference,
the rotary kiln further includes a heating zone that extends axially along a downstream side of the non-heating zone and is provided with a heater on an outer circumference thereof such that the inner circumference thereof is heated,
the non-heating zone includes a spiral blade on an inner circumferential surface configured to transfer the biomass molded body from the non-heating zone to the heating zone,
the heating zone includes a lifter blade extending axially along an entire length of an inner circumferential surface thereof, and
the lifter blade protrudes toward a rotational axis of the rotary kiln from the inner circumferential surface of the heating zone.