A manufacturing method for a carbon heat source comprises: a step A1 of forming a first groove in a state where the plurality of carbon members are aligned in one line; a step A2 of changing, subsequent to the step A1 being performed, an orientation of the plurality of carbon members so that the first groove formed in the plurality of carbon members crosses relative to the first predetermined direction in a state where the plurality of carbon members are aligned in one line; and a step A3 of forming, subsequent to the step A2 being performed, a second groove in a state where the plurality of carbon members are aligned in one line.

A biomass fuel processing pellet mill and a control method thereof are provided. The pellet mill includes a conditioner, a conveyor, and a pressing unit connected in series. The pressing unit includes a pressing housing, a ring die, a roller assembly, and an adjustment component. The adjustment component is connected to the roller assembly. The roller assembly includes a roller body and shift lever components. By setting the shift lever components, it can utilize the shift lever components to agitate the material between the ring die and the roller in the process of rotating a roller driven by the ring die, so as to improve the fluidity of the material between the ring die and the roller, and to reduce or avoid the flow of the material within the deformation-compression zone to the direction of a feeding zone when it is subjected to high-pressure extrusion, thereby improving granulation efficiency and reduce energy consumption. The control method includes: calculating a duration of the shift lever in a deformation-compression zone and a duration of the shift lever retracting into the roller body based on an inner diameter of the ring die, a diameter of the roller body, a gap between the ring die and the roller body, and a real-time angular velocity of the roller body.