▎ 摘　　要

NOVELTY - The method involves inserting the graphite intake pipe into the liquid metal. The mixed gas containing carbon source gas/nitrogen gas is introduced into the liquid metal through the graphite inlet pipe (3). Graphene powder is grown in the liquid metal, and the carbon-containing source gas is disconnected, the nitrogen flow is kept unchanged, and the growth of graphene powder is suspended after the graphene powder is continuously grown for a predetermined time. The temperature of molten liquid metal is adjusted. The air outlet of the graphite inlet pipe is moved out of the liquid metal surface, and then the oxygen/nitrogen gas mixture is introduced into the graphite inlet pipe. The oxygen is disconnected, the nitrogen flow rate remains unchanged, and the temperature is lowered after the oxygen/nitrogen mixed gas is fed for a set time. USE - Air inlet pipe inner wall carbon removing method for chemical vapor deposition (CVD) growth graphene powder,. Uses include but are not limited to material science, micro-nanometre processing, energy and biomedicine. ADVANTAGE - The method can efficiently remove carbon on the inner wall of the air inlet pipe, and has simple operation, short time from the growth of the suspended graphene powder to the re-growth interval and the graphene powder has high growth efficiency. DESCRIPTION OF DRAWING(S) - The drawing shows a core component structure diagram of the CVD growth graphene powder growth. Graphite crucible (1) Liquid copper (2) Graphite inlet pipe (3) Heating furnace (4) Carbon (5)