The reducing type pipeline
natural gas hydrogen-doped mixer comprises a mixer main pipeline, the inlet end of the mixer main pipeline is provided with a reducing taper
pipe section extending inwards, the small-
diameter end of the reducing taper
pipe section is communicated with a hole type injection
pipe section, and a
hydrogen conveying inlet pipeline is arranged on the side wall of the mixer main pipeline in a sealed and penetrating mode; an outlet of the
hydrogen conveying inlet pipeline communicates with an injection hole of the hole type injection pipe section, and hydrogen enters the hole type injection pipe section through the hydrogen conveying inlet pipeline in a cross flow
jet flow mode to be mixed with
natural gas. A variable-
diameter static mixer is further arranged in the mixer main pipeline, the small-
diameter section of the variable-diameter
static mixer can be inserted into the hole type injection pipe section, and the large-diameter section of the variable-diameter
static mixer is arranged at the position, close to the outlet end, in the mixer main pipeline. The flow speed of
natural gas is increased through the gradually-shrunk taper pipe section,
jet flow acceleration of hydrogen is achieved through the hole type injection pipe section,
kinetic energy of the natural gas and the hydrogen is fully utilized, and rapid, uniform and efficient mixing of hydrogen doped natural gas can be well achieved.