Stal-laval Apparat Ab

Lars Bratthall

Erik Henriksson

Lars Olof Ingesson

Bernt Lindstrom

A plurality of mutually parallel finned tubes forming a heat exchanger are positioned so closely together that the peripheries of mutually oppositely extending segments of the tube's respective fins are not substantially interspaced. To support the finned tubes, one or more groups of those segments are shortened to form transverse passages through which tube support members are passed transversely with respect to the tubes.

Finned tube heat exchanger construction

The apparatus comprises a test tube having substantially the same composition as the heat-exchanger tube suspected as fouling internally. A pressure chamber encloses this test tube and forms a space around the test tube and isolated from external influences. This pressure chamber has means for filling the space around the test tube with a vapor that condenses to liquid on the outside of the test tube, the pressure in the pressure chamber being dependent on whether or not or the degree the vapor condenses to liquid on the test tube. Means are provided for measuring the fluid pressure on the inside of the pressure chamber, this means providing a measure of the heat exchange between the vapor and any medium flowing inside of the test tube. Therefore, by connecting this apparatus so that the medium flowing through the heat-exchanger tube is shunted, in part, through the test tube of this apparatus, the apparatus provides a measure of fouling occurring inside of the heat-exchanger tube because substantially the same fouling occurs inside of the test tube of this apparatus, the degree of which can be continuously monitored by observation or automatic recording of the fluid pressure in the pressure chamber of the apparatus.

Apparatus for measuring fouling on the inside of a heat-exchanger tube

Condenser for a gaseous media such as steam, comprising a plurality of longitudinal tubes, generally several thousands, through which a coolant passes. Steam is passed around these tubes, and the tubes are braced at selected locations in longitudinal direction by means of brace plates or the like, and the steam is passed from the periphery of the heat exchanger and toward the interior thereof during condensaton. The condenser comprises a casing or shell and one or more nests of tubes and means for circulating steam around the entire or greater part of the periphery, and within each tube nest, an air-cooler device is placed centrally or substantially centrally, which air-cooler extends along the entire length of the tube nest. The brace plates are provided with flow channels effective to distribute the gaseous media about the condenser in response to fluctuation in condensing capacity along the tube nests.

Growing community of inventors

Linkoping, Sweden

Lars Bratthall