Using the gasified LNG mixing air as source gas of biogas peak shaving was proposed as a solution that the biogas output is unstable.In order to obtain the mixed gas

a LNG air ejector mixer was designed and processed

and the ejector mixer was investigated experimentally in the simulation of actual production for obtaining the operating characteristics.The results indicate that the air and gas mixing ratio markedly rises with the increase of inlet pressure when the outlet pressure is constant

but the result is opposite when the inlet pressure is constant.Under the condition of interacting by both the inlet and outlet pressure

the air and gas mixing ratio drops with the increase of outlet pressure when the inlet pressure increases

and the tendency of dropping is step-down.But the tendency is completely opposite when the outlet pressure increases.In order to match the outlet pressure of biogas fermentation tank

the ejector mixer should keep the inlet pressure of 0.25 MPa.