Abstract An apparatus permitting observation of the true nature of effluent gas traversing a stack. The apparatus is instrumental in forming an air curtain around the outlet end of the stack where the exhaust gases traversing the stack are emitted from the restrictive closure of the stack to the atmosphere. An air curtain so produced creates a transparent barrier that separates the hot moisture bearing effluent gases of the stack from the cooler air of the surrounding atmosphere to delay cooling the gases passing up through the exhaust stack until they pass beyond the air curtain and are discharged to the atmosphere. Delay in cooling the effluent gas prevents it from condensing as visible clouds and thus permits observation at this point to present a true appearance of the effluent.
A stack for the discharge of hot exhaust gases to the cooler atmosphere comprising an open ended duct, a collar surrounding the outlet end of the duct in spaced relation arranged to provide a plenum chamber therebetween, an inlet port in said chamber, a source of compressed air, a passageway directing a quantity of compressed air from its source to the inlet port of said chamber, heating means in the passageway supplying compressed air to said chamber, and means educting compressed air from said chamber in a pattern that comprises an air curtain as a transparent extension for the walls of the open ended duct whereupon said air curtain will form a transparent barrier intermediate the hot exhaust gases and the cooler atmosphere.
Claim 2
Dependent Claim
123 words
A stack for the discharge of hot exhaust gases to the cooler atmosphere comprising an open ended duct, a collar surrounding the outlet end of the duct in spaced relation arranged to provide a plenum chamber therebetween, an inlet port in said chamber, a source of compressed air, a passageway directing a quantity of compressed air from its source to the inlet port of said chamber, heating means in the passageway supplying compressed air to said chamber, and means educting compressed air from said chamber in a pattern that comprises an air curtain as a transparent extension for the walls of the open ended duct whereupon said air curtain will form a transparent barrier intermediate the hot exhaust gases and the cooler atmosphere.
Claim 3
Dependent Claim
54 words
A stack for the discharge of exhaust gases in the manner defined in claim 1 including drying means in the passageway supplying compressed gas to the plenum chamber whereby moisture is removed from the compressed air before it is educted from the plenum chamber as a transparent extension of the end of the stack.