Production process of expanding single line capacity of acetylene black by mixing gas

The invention discloses a production process of expanding single line capacity of acetylene black by mixing gas. The production process comprises the following steps: a, transforming an acetylene cracking furnace, and additionally arranging a raw material gas inlet; b, introducing first raw material acetylene gas into the acetylene cracking furnace through the raw material gas inlet, and introducing second raw material gas into the acetylene cracking furnace through a newly arranged gas inlet after acetylene gas starts to crack, wherein the second raw material gas can absorb heat generated byacetylene cracking for self decomposition and cracking; c, when the acetylene gas is constant, controlling the outlet temperature of the cracking furnace according to the furnace pressure, and adjusting the amount of a cooling medium so as to achieve the purposes of intercepting flames and cooling, terminating a carbon black reaction, diluting concentration of carbon black and preventing coking; and d, carrying out follow