Bamboo charcoal manufacturing method

Abstract

To provide a method capable of producing halogen-free bamboo charcoal with effectively reduced chlorine content without a cleaning process.SOLUTION: A method for manufacturing halogen-free bamboo charcoal according to the present invention includes: a carbonization step for carbonizing bamboo chips by housing the bamboo chips in a carbonization processing space and supplying superheated steam generated by a superheated steam generation mechanism for carbonization; a carbonization exhaust line having one end part fluidically connected to the carbonization processing space and the other end part opened to the outside; and a carbonization exhaust fan interposed with the carbonization exhaust line, wherein the carbonization processing is executed in a state where the carbonization exhaust fan is operated so that the upstream side of the carbonization exhaust fan in the carbonization exhaust line becomes a predetermined pressure reduction range while the superheated steam generation mechanism for carbonization is operated so that the carbonization processing temperature in the carbonization processing space is maintained at 450 to 600°C.SELECTED DRAWING: Figure 1

Claims

[Claim 1] A method for producing bamboo charcoal from bamboo chips, The system includes a carbonization process in which bamboo chips are placed in a carbonization processing space and superheated steam generated by a carbonization superheated steam generation mechanism is supplied to perform carbonization on the bamboo chips. A carbonization exhaust line is provided, with one end of which is fluidly connected to the carbonization processing space and the other end open to the outside, and a carbonization exhaust fan is inserted into the carbonization exhaust line. A method for producing bamboo charcoal, characterized in that the carbonization treatment is carried out while operating the carbonization superheated steam generation mechanism so that the carbonization treatment temperature in the carbonization treatment space is maintained at 450°C to 600°C, and operating the carbonization exhaust fan so that the pressure upstream of the carbonization exhaust fan in the carbonization exhaust line is 100 to 300 Pa. [Claim 2] The carbonization process is carried out by a carbonization apparatus comprising a water supply unit, a carbonization unit, and a control unit. The carbonized portion is A carbonization case that forms a carbonization treatment space, A carbonization screw conveyor that transports bamboo chips from one side to the other in the axial direction of the carbonization case in accordance with rotational drive around the axis, The carbonization superheated steam generation mechanism supplies superheated steam, generated by heating steam or atomized water supplied from the water supply unit, into the carbonization case. The carbon exhaust line, one end of which is fluidly connected to the inside of the carbonization case, The carbon exhaust fan inserted into the carbon exhaust line, A carbonization temperature sensor for detecting the temperature inside the carbonization case, The carbonization pressure sensor detects the pressure upstream of the carbonization exhaust fan in the carbonization exhaust line, The method for manufacturing bamboo charcoal according to claim 1, characterized in that the control unit controls the operation of the carbonization screw conveyor so that the transport speed of the carbonization screw conveyor becomes a predetermined set speed, and controls the operation of the carbonization superheated steam generation mechanism so that the carbonization processing temperature in the carbonization case becomes 450°C to 600°C based on the value detected from the carbonization temperature sensor, while controlling the operation of the carbonization exhaust fan so that the pressure upstream of the carbonization exhaust fan in the carbonization exhaust line is maintained at 100 to 300 Pa based on the value detected from the carbonization pressure sensor. [Claim 3] Prior to the carbonization process, a drying process is provided in which bamboo chips are placed in a drying space and dried by supplying superheated steam generated by a drying superheated steam generation mechanism. A drying exhaust line is provided, with one end of which is fluidly connected to the drying processing space and the other end open to the outside, and a drying exhaust fan is inserted into the drying exhaust line. The method for producing bamboo charcoal according to claim 1, characterized in that the drying process is carried out while operating the drying superheated steam generation mechanism so that the temperature in the drying process space is maintained within a predetermined drying process temperature range, and operating the drying exhaust fan so that the pressure upstream of the drying exhaust fan in the drying exhaust line is 100 to 300 Pa. [Claim 4] The drying and carbonization processes are carried out by a carbonization apparatus comprising a water supply unit, a drying unit, a carbonization unit, and a control unit. The drying section is A drying case that forms a drying space, A drying screw conveyor that transports bamboo chips from one side to the other in the axial direction of the drying case in accordance with rotational drive around the axis, The drying superheated steam generating mechanism supplies superheated steam, which is generated by heating steam or atomized water supplied from the water supply unit, into the drying case. The drying exhaust line, one end of which is fluidly connected to the inside of the drying case, The drying exhaust fan inserted into the drying exhaust line, A drying temperature sensor for detecting the temperature inside the drying case, The system includes a drying pressure sensor that detects the pressure upstream of the drying exhaust fan in the drying exhaust line, The carbonized portion is A carbonization case that forms a carbonization processing space and directly or indirectly receives dried bamboo chips discharged from the other side in the axial direction of the drying case, A carbonization screw conveyor that transports bamboo chips from one side to the other in the axial direction of the carbonization case in accordance with rotational drive around the axis, The carbonization superheated steam generation mechanism supplies superheated steam, generated by heating steam or atomized water supplied from the water supply unit, into the carbonization case. The carbon exhaust line, one end of which is fluidly connected to the inside of the carbonization case, The carbon exhaust fan inserted into the carbon exhaust line, A carbonization temperature sensor for detecting the temperature inside the carbonization case, The carbonization pressure sensor detects the pressure upstream of the carbonization exhaust fan in the carbonization exhaust line, The control unit controls the operation of the drying screw conveyor so that the conveying speed of the drying screw conveyor becomes a predetermined set speed, and controls the operation of the drying superheated steam generation mechanism so that the temperature inside the drying case becomes a predetermined drying processing temperature based on the value detected from the drying temperature sensor, while controlling the operation of the drying exhaust fan so that the pressure upstream of the drying exhaust fan in the drying exhaust line is maintained at 100 to 300 Pa based on the value detected from the drying pressure sensor, and controls the operation of the carbonization screw conveyor so that the conveying speed of the carbonization screw conveyor becomes a predetermined set speed, and controls the operation of the carbonization superheated steam generation mechanism so that the carbonization processing temperature inside the carbonization case becomes 450°C to 600°C based on the value detected from the carbonization temperature sensor, while controlling the operation of the carbonization exhaust fan so that the pressure upstream of the carbonization exhaust fan in the carbonization exhaust line is maintained at 100 to 300 Pa based on the value detected from the carbonization pressure sensor, characterized in that the control unit controls the operation of the carbonization exhaust fan so that the pressure upstream of the carbonization exhaust fan in the carbonization exhaust line is maintained at 100 to 300 Pa.

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