| abstract |
The invention discloses a two-stage rotational flow ammonia air mixing device based on a Laval nozzle, which comprises a mixing unit and an air inlet unit, wherein the mixing unit comprises a sleeve, one side of the sleeve is connected with an air inlet through a flange, and the inner space of the sleeve can be taken as a mixing chamber of air and ammonia; the air inlet unit comprises an air inlet pipe, and one end of the air inlet pipe penetrates through the sleeve and extends to the inner space; the invention adopts the design of double impellers which are independent from each other, the deflection angle of one impeller is arranged at a positive 45 degrees, and the deflection angle of the other impeller is arranged at a negative 45 degrees, so that the mixed gas is mixed downstream when passing through the former impeller and mixed upstream when passing through the second impeller, and the ammonia gas and the air are mixed more sufficiently and uniformly, thereby realizing the purpose of rapidly reducing the ammonia concentration to 5 percent which is far lower than the explosion concentration of gaseous ammonia by 15 percent. |