Method and device for preparing graphene and hydrogen gas by converting waste plastics with joule heat

A device for preparing graphene and hydrogen gas by converting plastic waste with Joule heat, comprising an airtight reaction chamber, a gas collecting system and a power control system, wherein

• the airtight reaction chamber comprises:
• a central quartz chamber configured to hold a conductive mixture,
• two refractory, gas permeable and conductive auxiliary electrodes arranged on the left and right sides of the conductive mixture, and
• two hollow electrodes inserted from the left and right sides of the conductive mixture,
• wherein a gas inlet pipeline is arranged outside the airtight reaction chamber and configured to transport inert protective gas into the airtight reaction chamber;
• the gas collecting system comprises:
• a filter cold trap configured to filter off solid particles and a waxy by-product and connected with an outer part of the hollow electrodes,
• a pressure-resistant gas collecting pipeline,
• a gas collecting unit, and
• a gas pressure control unit arranged on the pressure-resistant gas collecting pipeline and connected to the gas collecting unit,
• wherein the gas inlet pipeline of the airtight reaction chamber, the filter cold trap, and the pressure-resistant gas collecting pipeline of the gas collecting system are connected by a three-way valve, and
• the hollow electrodes, the filter cold trap, the three-way valve, and the pressure-resistant gas collecting pipeline together form an airtight passage;
• wherein the power control system is configured to regulate an output voltage, an on-off state, an on-off time and an on-off mode of a circuit according to resistance of the conductive mixture in the airtight reaction chamber.