Patent ID: 9089808
Filing Date: 2015-07-28
Classification: B01D,F28D

Abstract:
1. Method for purifying a foreign-substance-laden gas flow of the foreign substance, with the gas flow being conducted through a shell and tube heat exchanger and being placed in thermal contact with a cooling medium in order to freeze and/or condense the foreign substance out, the purification taking place in only one shell and tube heat exchanger comprising: a shell, a first end region, a second end region, a first tube plate adjacent the first end region, a second tube plate adjacent the second end region, a first group of tubes extending along inside the shell from the first tube plate to the second tube plate, a second group of tubes extending along inside the shell from the second tube plate to the first tube plate, a first dome in the first end region adjacent the first tube plate, wherein the first dome is divided by a first partition into an upper first dome part and a lower first dome part, a second dome in the second end region adjacent the second tube plate, wherein the second dome is divided by a second partition into an upper second dome part and a lower second dome part, wherein the upper first dome part and the upper second dome part are connected to the first group of tubes from the first end region and the second end region, respectively, and the lower first dome part and the lower second dome part are connected to the second group of tubes from the first end region and the second end region, respectively, wherein a deflection that fluidly communicates between the interior space at the second end region and an interior of the upper second dome part; wherein an interior space of the shell and tube heat exchanger is defined by an inner surface of the shell, an inner surface of the first tube plate, an inner surface of the second tube plate, and outer surfaces of the tubes of the first and second tubes in between the first and second tube plates, said method comprising the steps of: allowing the foreign-substance-laden gas to flow through the interior space from the first end region to in the second end region; allowing a cooling medium to traverse the first group of tubes from the lower second dome part in the second end region to the lower first dome part in the first end region, wherein the gas flow conducted through the interior space is cooled by way of contact with the first group of tubes; withdrawing the gas flow, in the second end region, from the interior spacely the deflection; introducing the withdrawn gas to the upper second dome part; allowing the withdrawn gas to flow into and through the second group of tubes from the upper second dome part in the second end region to the upper first dome part in the first end region while undergoing an exchange of heat with the gas flow flowing into the interior space through direct contact between the gas flow flowing in the interior space and the tubes of the second group of tubes; and the foreign-substance-laden gas flowing in the interior space is cooled through counter-flow heat exchange by the combined power of the cooling medium in the first group of tubes and the gas flow in the second group of tubes.