Patent ID: 9360145
Filing Date: 2016-06-07
CPC Classification: C25C,F27B,F27D,F28D,F28F,Y02P,Y10T

Claim Text:
1. A raw gas collection system for collecting raw gas from a plurality of aluminium smelting pots, the raw gas collection system comprising: a common collection duct for channeling a common collection duct flow of raw gas in a common collection duct flow direction toward a gas cleaning unit with a suction fan arranged downstream of the gas cleaning unit; a plurality of branch ducts each having an inlet connected to a smelting pot for drawing a respective branch flow of raw gas therefrom, and a discharge end connected to the common collection duct, said discharge end equipped with an alignment section for aligning the respective branch flow with the direction of said common collection duct flow, an adjustable discharge aperture, and a constriction for accelerating the respective branch flow through the discharge aperture into the common collection duct; each of at least two branch ducts of said plurality of branch duct provided with a respective heat exchanger; each of at least two other branch ducts of said plurality of branch duct being without a heat exchanger; wherein said at least two branch ducts with heat exchangers are connected to the common collection duct downstream of said at least two other branch ducts without heat exchangers operable with balanced gas flow through each of the plurality of branch ducts; and each of said heat exchangers provided with a respective heat transfer element located in the respective branch flow for transferring heat from the respective branch flow of raw gas to a heat transfer medium, each respective heat transfer element being configured for generating a flow resistance in the respective branch duct to balance the branch flows of said at least two branch ducts.