US 10,981,080 B2
Heat transfer tube and method for manufacturing a heat transfer tube
Lars Olausson, Angered (SE)
Assigned to VALMET AB, Sundsvall (SE)
Appl. No. 16/481,548
Filed by VALMET AB, Sundsvall (SE)
PCT Filed Feb. 2, 2018, PCT No. PCT/SE2018/050088
§ 371(c)(1), (2) Date Jul. 29, 2019,
PCT Pub. No. WO2018/143885, PCT Pub. Date Aug. 9, 2018.
Claims priority of application No. 1750094-3 (SE), filed on Feb. 3, 2017.
Prior Publication US 2020/0024802 A1, Jan. 23, 2020
Int. Cl. B01D 1/06 (2006.01); B01D 1/30 (2006.01); F28F 1/34 (2006.01); B21D 22/02 (2006.01); B21D 51/10 (2006.01); D21C 11/00 (2006.01); D21C 11/10 (2006.01); B23K 11/00 (2006.01); B23K 11/16 (2006.01); B23K 101/06 (2006.01); B23K 103/04 (2006.01); B23K 101/08 (2006.01)
CPC B01D 1/065 (2013.01) [B01D 1/30 (2013.01); B21D 22/02 (2013.01); B21D 51/10 (2013.01); B23K 11/0073 (2013.01); B23K 11/16 (2013.01); D21C 11/0007 (2013.01); D21C 11/10 (2013.01); F28F 1/34 (2013.01); B23K 2101/06 (2018.08); B23K 2101/08 (2018.08); B23K 2103/05 (2018.08); F28F 2275/06 (2013.01)] 19 Claims
OG exemplary drawing
 
1. A heat transfer tube for falling film evaporation of water solutions and suspensions emanating from handling of materials of biological origin, the heat transfer tube having:
a heating medium surface configured to be heated by a heating medium; and
a falling film surface opposite and facing away from the heating medium surface, the falling film surface configured to have spent liquor pass over the falling film surface as a falling film and configured to evaporate solvent from the falling film and thus increase dry matter content;
wherein the heat transfer tube comprises a sheet metal material,
wherein the falling film surface of the heat transfer tube is equipped with a multitude of stamped bumps formed by protrusions or indentations,
wherein each stamped bump is spaced apart along a longitudinal axis of the heat transfer tube from a neighbouring stamped bump by 3-250 mm, has a height or depth in the range of 0.3-5.0 mm, has a width in the range 1.0-20 mm, and has an inclination angle versus an orthogonal plane that is orthogonal to the longitudinal axis of the heat transfer tube in a range of 0-70 degrees.