Patent ID: 8398933
Filing Date: 2013-03-19
Classification: B01J,C01B,Y10S,Y10T

Abstract:
1. An apparatus for preventing corrosion on and in a region of a gas inlet nozzle during nitric acid condensation, the apparatus comprising: (a) a nitric acid condenser; (b) the gas inlet nozzle, the gas inlet nozzle passing into an interior portion of the nitric acid condenser; and (c) a sleeve on an inside portion of the gas inlet nozzle in a transition region to the interior portion of the condenser to form a gas inlet orifice comprising an annular gap having an annular space between the sleeve and the gas inlet nozzle, the annular space comprising at least one feed opening for secondary air so that at the entry to the interior portion of the condenser the secondary air from the annular space can form an enveloping flow around NO gas being introduced through an inside of the sleeve; wherein a plurality of secondary air inlet orifices are provided on the gas inlet nozzle upstream in a direction of flow of NO gas entering the gas inlet nozzle; and wherein the sleeve extends further into the nitric acid condenser than the gas inlet nozzle extends into the nitric acid condenser.