Patent ID: 8602634

Claim:
A feeding device for feeding chemical into a process liquid flowing in a process liquid flow duct, the feeding device comprising: a nozzle casing, a feeding liquid duct terminating at a feed opening, and a mixing apparatus within the nozzle casing and including: a mixing space isolated from the feeding liquid duct, a chemical feed duct to pass the chemical to the mixing space, and a mixing liquid feed duct to pass a mixing liquid to the mixing space, the mixing liquid feed duct having a sidewall and a closed end; wherein the closed end and the sidewall define said mixing space, the mixing space has at least one outlet opening in the sidewall of the mixing liquid feed duct for feeding a mixture of the chemical and the mixing liquid to the feeding liquid duct, the closed end is impervious to the mixture, and the chemical feed duct extends into the mixing space and past the at least one outlet opening.