Patent SE-1750799-A1 (SE)
Title: Apparatus and method for separation of components with different volatility in a mixed fluid
Inventor: SÄLLSTRÖM STIG
IPC: F28B1/02
Filed: 2017-06-21
Abstract: The invention concerns an apparatus (10) for separation of components with different volatility in a mixed fluid, such as an unclean condensate generated in a plant for producing chemical or semi-chemical cellulose pulp, said apparatus (10) comprising: a first heat-exchanging unit (100) provided with first and second flow path structures (131, 132) extending between a first and a second end portion (101, 102) thereof and forming separate flow paths for a first and a second fluid flow through the first heat-exchanging unit (100), wherein the first end portion (101) is intended to form an upper portion and the second end portion (102) is intended to form a lower portion of the first heat-exchanging unit (100) during operation of the apparatus (10); an inlet (118) for feeding the mixed fluid to the apparatus (10), wherein the mixed fluid feeding inlet (118) is arranged in fluid communication with the first flow path structure (131) at the upper end portion (101) of the first heatexchanging unit (100); an inlet (119) for feeding steam to the apparatus (10), wherein the steam feeding inlet (119) is arranged in fluid communication with the first flow path structure (131) at the lower end portion (102) of the heatexchanging separation unit (100); an arrangement for feeding a cooling medium through the apparatus (10), wherein said arrangement comprises at least one cooling medium inlet (105, 106, 107, 108) arranged in fluid communication with the second flow path structure (132) at the first (upper) end portion (101) of the first heat-exchanging unit (100). The invention is characterized in that the apparatus (10) comprises a second heatexchanging unit (200) arranged at the first end portion (101) of the first heatexchanging unit (100) so as to be located above the first heat-exchanging unit (100) during operation of the apparatus (10), wherein the second heatexchanging unit (200) is provided with third and fourth flow path structures (233, 234) extending between a first/upper and a second/lower end portion (201, 202) thereof and forming separate flow paths for a first and a second fluid flow through the second heat-exchanging unit (200), wherein the first portion (201) is intended to form an upper end portion and the second portion (202) a lower end portion of the second heat-exchanging unit (200) during operation of the apparatus (10), wherein the cooling medium arrangement comprises at least one cooling medium inlet (205, 206, 207, 208) arranged in fluid communication with the fourth flow path structure (234) at the first (upper) end portion (201) of the second heat-exchanging unit (200), and wherein the first and third flow path structures (131, 233) are arranged in fluid communication with each other so that a flow of evaporated fluid exiting the first flow path structure (131) at the upper end portion (101) of the first heatexchanging unit (100) can flow further upwards into the third flow path structure (233) of the second heat-exchanging unit (200) and so that a flow of condensed fluid exiting the third flow path structure (233) at the lower end portion (202) of the second heat-exchanging unit (200) can flow further downwards into the first flow path structure (131) of the first heat-exchanging unit (100).